【JavaSE】GUI编程
前言
本文为Java基础GUI编程相关知识,Java全栈学习路线可参考:【Java全栈学习路线】最全的Java学习路线及知识清单,Java自学方向指引,内含最全Java全栈学习技术清单~
一、GUI简介
GUI的核心技术: Swing, AWT
GUI缺点与不足:
- 1.界面不美观
- 2.需要jre环境
为什么要学习GUI?
- 可以写出自己心中想要的一些小工具。
- 工作时候,也可能维护到swing界面,但概率极小。
- 了解MVC架构,了解监听!
二、AWT
1. AWT介绍
- 包含了很多类和接口!GUI:图像用户界面。 Eeclipse:java环境写的
- 元素:窗口、按钮、文本框
- java.awt包里
2.组件和容器
Frame
package com.wang.lesson1;
import java.awt.*;
//GUI的第一个界面
public class TestFrame {
public static void main(String[] args) {
//Frame,JDK 看源码;
Frame frame = new Frame("我的第一个java图形界面窗口");
//设置可见性 w h 没有
frame.setVisible(true);
//设置窗口大小
frame.setSize(400, 400);
//背景颜色 Color
Color color = new Color(155, 89, 104);
frame.setBackground(color);
//弹出的初始位置
frame.setLocation(200, 200);
//设置大小固定
frame.setResizable(false);
}
}
问题:窗口无法关闭—>需通过强制java停止运行来关闭
面板panel
- 解决了无法关闭问题,即调用addWindowsListener方法的子方法,并重写其中的WindowsClosing方法,来调用程序关闭的.exit(0)方法
package com.wang.lesson1;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
//Panel 可以看成一个空间,但是不能单独存在,得放在Frame上
public class TsetPanel {
public static void main(String[] args) {
//窗口
Frame frame = new Frame();
//布局的概念
//面板
Panel panel = new Panel();
/*设置布局 不设置会默认置顶
未设置Layout时,java默认为flowLayout布局的,
设置为null即为清空布局管理器,之后添加组件,常常是设置组件左上角坐标相
对于容器左上角(0,0)的x,y值来确定组件的位置,即使更改容器大小也不会
改变位置。这种方式常常用于窗体大小固定的容器里。*/
frame.setLayout(null);
//坐标
frame.setBounds(300,300,500,500);
frame.setBackground(new Color(59, 164, 125));
//panel 设置坐标,相对于Frame的坐标
panel.setBounds(50,50,200,200);
panel.setBackground(new Color(90, 46, 30));
//frame.add(panel)frame添加面板
frame.add(panel);//Panel经过三层继承,最终继承了Component
frame.setVisible(true);
//监听时间,监听窗口关闭事件 System.exit(0)
//适配器模式: new 重写的太多了 new其子类 本来new WindowsListener的,但是要重写的实在太多了
frame.addWindowListener(new WindowAdapter() {
//窗口点击关闭的时候需要做的事情
@Override
public void windowClosing(WindowEvent e) {
//结束程序
System.exit(0);
}
});
}
}
3.布局管理器
流式布局 从左到右
package com.wang.lesson1;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class TsetFlowLayout {
public static void main(String[] args) {
Frame frame = new Frame();
//组件-按钮
Button button1 = new Button("button1");
Button button2 = new Button("button2");
Button button3 = new Button("button3");
//设置为流式布局
//frame.setLayout(new FlowLayout());默认是中
//frame.setLayout(new FlowLayout(FlowLayout.LEFT));
frame.setLayout(new FlowLayout(FlowLayout.RIGHT));
frame.setSize(200,200);
frame.setVisible(true);
frame.add(button1);
frame.add(button2);
frame.add(button3);
frame.addWindowListener(new WindowAdapter() {
//窗口点击关闭的时候需要做的事情
@Override
public void windowClosing(WindowEvent e) {
//结束程序
System.exit(0);
}
});
}
}
东西南北中
package com.wang.lesson1;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class TestBorderLayout {
public static void main(String[] args) {
Frame frame = new Frame("TestBorderLayout");
Button east = new Button("East");
Button west = new Button("West");
Button south = new Button("South");
Button north = new Button("North");
Button center = new Button("Center");
frame.add(east,BorderLayout.EAST);
frame.add(west ,BorderLayout.WEST);
frame.add(south ,BorderLayout.SOUTH);
frame.add(north ,BorderLayout.NORTH);
frame.add(center,BorderLayout.CENTER);
frame.setSize(300,300);
frame.setVisible(true);
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
表格布局三行两列这种Grid
package com.wang.lesson1;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class TestGridLayout {
public static void main(String[] args) {
Frame frame = new Frame("TsetGridLayout");
Button button1 = new Button("button1");
Button button2 = new Button("button2");
Button button3 = new Button("button3");
Button button4 = new Button("button4");
Button button5 = new Button("button5");
Button button6 = new Button("button6");
frame.setLayout(new GridLayout(3,2));
frame.add(button1);
frame.add(button2);
frame.add(button3);
frame.add(button4);
frame.add(button5);
frame.add(button6);
frame.pack();//让布局变得好看
frame.setVisible(true);
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
4.事件监听
事件监听:当某个事件发生的时候,干什么?
package com.wang.lesson2;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class TestActionEvent {
public static void main(String[] args) {
//按下按钮,触发一些事件
Frame frame = new Frame();
Button button1 = new Button("button1");
//因为addActionListener需要ActionListener,因此我们需要构造一个ActionListener
MyActionListener myActionListener = new MyActionListener();
button1.addActionListener(new MyActionListener());
frame.add(button1, BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
windowsClosing(frame);
}
//关闭窗体的事件
private static void windowsClosing(Frame frame){
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
//事件监听
static class MyActionListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("11");
}
}
}
多个按钮共享一个事件
package com.wang.lesson2;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.FileOutputStream;
public class TestActionEvent2 {
public static void main(String[] args) {
//两个按钮,实现同一个监听
Frame frame = new Frame("1111");
Button button1 = new Button("start");
Button button2 = new Button("stop");
//可以显示的定义出发会返回的命令,如果不显示定义,则会走默认值
//可以多个按钮只写一个监听类
button1.setActionCommand("3333");
My my = new My();
button1.addActionListener(my);
button2.addActionListener(my);
frame.add(button1, BorderLayout.WEST);
frame.add(button2, BorderLayout.EAST);
frame.pack();
frame.setVisible(true);
}
static class My implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
//e.getActionCommand()获得按钮的信息
System.out.println("按钮被点击了:msg" + e.getActionCommand());
}
}
}
5.输入框事件监听
- 输入框中输入的字,可以打印出来,并将输入的字全部删除。
package com.wang.lesson2;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class TestText01 {
public static void main(String[] args) {
//启动!只负责启动
new MyFrame();
}
}
class MyFrame extends Frame{
public MyFrame(){
TextField textField = new TextField();
add(textField);
//监听这个文本框输入的文字
//按下回车键,就会触发这个输入框的事件,在下边的重写方法中重写的语句为 获得输入框的文本并打印
textField.addActionListener(new My());
//设置替换编码
textField.setEchoChar('*');
setVisible(true);
pack();
}
}
class My implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
TextField text = (TextField) e.getSource();//获得一些资源,返回的一个对象
System.out.println(text.getText());//获得输入框的文本
//每次都设置为空 即每次文本框输入完以后,都会全部删除清零
text.setText("");
}
}
6.画笔
package com.wang.lesson3;
import java.awt.*;
public class TestPaint {
public static void main(String[] args) {
new MYpaint().loadFrame1();
}
}
class MYpaint extends Frame{
public void loadFrame1(){
setBounds(200,200,600,400);
setVisible(true);
}
@Override
public void paint(Graphics g) {
//super.paint(g);有些类的父类有一些初始化操作,不能随便干掉
//画笔,需要颜色,画笔可以画画
g.setColor(Color.red);
g.drawOval(100,100,100,100);
g.fillOval(200,200,100,100);//实心的⚪
g.setColor(Color.green);
g.fillRect(300,300,40,20);
g.drawRect(300,350,40,20);
//养成习惯 画笔画完,将他还原到最初的颜色
g.setColor(Color.BLACK);
}
}
7.鼠标监听
以实现鼠标画画为例:
package com.wang.lesson3;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.Iterator;
//鼠标监听事件
public class TestMouseListener {
public static void main(String[] args) {
new MyFrame("画图");
}
}
//自己的类
class MyFrame extends Frame {
//画画需要画笔,需要监听鼠标当前的位置,需要集合来存储这个点
ArrayList points;
public MyFrame(String title) {
super(title);
setBounds(100, 100, 500, 400);
//存鼠标的点
points = new ArrayList<>();
//鼠标监听器,针对这个窗口
setVisible(true);
this.addMouseListener(new MyML());
}
@Override
public void paint(Graphics g) {
//画画,监听鼠标的事件
Iterator iterator = points.iterator();
while (iterator.hasNext()){
Point point = (Point) iterator.next();
g.setColor(Color.BLUE);
g.fillOval(point.x,point.y,10,10);
}
}
//添加一个点到界面上
public void addPaint(Point point){
points.add(point);
}
//适配器模式
private class MyML extends MouseAdapter {
//鼠标 按下,弹起,按住不放
@Override
public void mouseClicked(MouseEvent e) {
MyFrame myframe = (MyFrame) e.getSource();
//这里我们点击的时候,就会在界面产生一个点
myframe.addPaint(new Point(e.getX(),e.getY()));
//每次点击鼠标都需要重新画一遍
myframe.repaint();//刷新
}
}
}
8.窗口监听
package com.wang.lesson3;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class TestWindow {
public static void main(String[] args) {
new WindowF();
}
}
class WindowF extends Frame {
public WindowF() {
setBackground(Color.BLUE);
setBounds(100, 100, 200, 200);
setVisible(true);
this.addWindowListener(
//匿名内部类
new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.out.println("windowsClosing");
System.exit(0);
}
@Override
public void windowActivated(WindowEvent e) {
WindowF source = (WindowF) e.getSource();
source.setTitle("已激活");
System.out.println("windowActivated");
}
});
}
/* @Override
public void windowClosing(WindowEvent e) {
setVisible(false);// 隐藏窗口
System.exit(0);//正常退出 1是非正常退出
};*/
}
9.键盘监听
package com.wang.lesson3;
import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.sql.SQLOutput;
//键
public class TestKeyListener {
public static void main(String[] args) {
new KeyF();
}
}
class KeyF extends Frame{
public KeyF(){
setBounds(0,0,300,400);
setVisible(true);
this.addKeyListener(new KeyAdapter() {
//键盘按下
@Override
public void keyPressed(KeyEvent e) {
int keyCode = e.getKeyCode();//不需要去记录这个数值,直接使用静态属性VK_xxx
System.out.println(keyCode);
if (keyCode == KeyEvent.VK_UP){
System.out.println("你按了上键盘");
//根据不同的操作,进行不同的结果
}
}
});
}
}
三、Swing
1.窗口、面板JFrame
package com.wang.lesson4;
import javax.swing.*;
import java.awt.*;
public class JFrameDemo {
//init();初始化
public void init(){
//顶级窗口
JFrame jf = new JFrame("这是一个JFrame窗口");
jf.setBounds(100,100,400,300);
//设置文字Label->JLabel
jf.setBackground(Color.BLUE);
JLabel jl = new JLabel("JJJJJ");
jf.add(jl);
//让文本标签居中
jl.setHorizontalAlignment(SwingConstants.CENTER);
//容器实例化
jf.getContentPane().setBackground(Color.red);
jf.setVisible(true);
//关闭事件
jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
//建立一个窗口
new JFrameDemo().init();
}
}
2.弹窗
package com.wang.lesson4;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class DialogDemo extends JFrame {
public DialogDemo() {
this.setVisible(true);
this.setBounds(100, 100, 400, 400);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
//Jframe 放东西,容器
Container contentPane = this.getContentPane();
//绝对布局
contentPane.setLayout(null);
//设置背景
contentPane.setBackground(Color.BLUE);
//按钮
JButton jButton = new JButton("点击弹出一个对话框");
jButton.setBounds(30, 30, 200, 50);
//点击按钮弹出弹框
jButton.addActionListener(new ActionListener() {//监听器
@Override
public void actionPerformed(ActionEvent e) {
//弹窗
new MyDialog();
}
});
contentPane.add(jButton);
}
public static void main(String[] args) {
new DialogDemo();
}
}
//弹窗的窗口
class MyDialog extends JDialog {
public MyDialog() {
this.setVisible(true);
this.setBounds(100, 100, 500, 500);
// this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
this.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
//JDialog退出只能是D0_ONTHING,HIDE,DISPOSE这三个中的一种
//应该是默认就有关闭事件
this.setTitle("这是一个弹窗");
Container contentPane = this.getContentPane();
contentPane.setLayout(null);
contentPane.setBackground(Color.ORANGE);
JLabel jjj = new JLabel("学习学习");
contentPane.add(jjj);
jjj.setBounds(20,20,50,50);
}
}
3.标签
label
new JLabel("xxx");
图标Icon
package com.wang.lesson4;
import javax.swing.*;
import java.awt.*;
//图标,需要实现类,Frame继承
public class IconDemo extends JFrame implements Icon {
private int width;
private int hight;
public IconDemo(){};//无参构造
//有参构造
public IconDemo(int width,int hight){
this.width = width;
this.hight = hight;
};
public void init(){
IconDemo iconDemo = new IconDemo(15, 15);
//图标可以放在标签,也可以放在按钮上!
JLabel jLabel = new JLabel("标签",iconDemo,SwingConstants.CENTER);
Container contentPane = getContentPane();
contentPane.add(jLabel);
this.setVisible(true);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
@Override
public void paintIcon(Component c, Graphics g, int x, int y) {
g.fillOval(x,y,width,hight);
}
@Override
public int getIconWidth() {
return this.width;
}
@Override
public int getIconHeight() {
return this.hight;
}
public static void main(String[] args) {
new IconDemo().init();
}
}
图片
package com.wang.lesson4;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
public class ImageIconDemo extends JFrame {
public ImageIconDemo(){
JLabel jLabel = new JLabel("图片");
URL resource = ImageIconDemo.class.getResource("4.png");
ImageIcon imageIcon = new ImageIcon(resource);
jLabel.setIcon(imageIcon);
jLabel.setHorizontalAlignment(SwingConstants.CENTER);
Container contentPane = getContentPane();
contentPane.add(jLabel);
this.setVisible(true);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setBounds(100,100,800,800);
}
public static void main(String[] args) {
new ImageIconDemo();
}
}
4.面板
JPanel
package com.wang.lesson5;
import javax.swing.*;
import java.awt.*;
public class JPanelDemo extends JFrame {
public JPanelDemo(){
Container contentPane = this.getContentPane();
contentPane.setLayout(new GridLayout(2,1,10,10));//后边两个是间距
JPanel jPanel = new JPanel(new GridLayout(1, 3));
JPanel jPane2 = new JPanel(new GridLayout(1, 2));
JPanel jPane3 = new JPanel(new GridLayout(1, 1));
jPanel.add(new JButton("aaa"));
jPanel.add(new JButton("bbb"));
jPanel.add(new JButton("ccc"));
jPane2.add(new JButton("111"));
jPane2.add(new JButton("222"));
jPane3.add(new JButton("---"));
setBounds(100,100,500,400);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
contentPane.add(jPanel);
contentPane.add(jPane2);
contentPane.add(jPane3);
setVisible(true);
contentPane.setBackground(Color.YELLOW);
}
public static void main(String[] args) {
new JPanelDemo();
}
}
JScrollPanel
package com.wang.lesson4;
import javax.swing.*;
import java.awt.*;
public class JScrollPanelDemo extends JFrame {
public JScrollPanelDemo(){
Container contentPane = this.getContentPane();
//文本域
JTextArea jTextArea = new JTextArea(20, 50);
jTextArea.setText("学习学习");
//面板 并添加到contentpane
contentPane.add(new JScrollPane(jTextArea));
this.setVisible(true);
this.setBounds(100,100,400,300);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
contentPane.setBackground(Color.BLUE);
}
public static void main(String[] args) {
new JScrollPanelDemo();
}
}
5.按钮
图片按钮
package com.wang.lesson5;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
public class JButtonDemo01 extends JFrame {
public JButtonDemo01(){
Container contentPane = this.getContentPane();
//图片变为图标
URL resource = JButtonDemo01.class.getResource("4.png");
Icon icon = new ImageIcon(resource);
JButton jButton = new JButton();
jButton.setIcon(icon);
//悬浮框
jButton.setToolTipText("这是一个图片按钮");
contentPane.add(jButton);
this.setVisible(true);
this.setBounds(100,100,400,300);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new JButtonDemo01();
}
}
单选按钮
package com.wang.lesson5;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
public class JButtonDemo02 extends JFrame {
public JButtonDemo02(){
Container contentPane = this.getContentPane();
//图片变为图标
URL resource = JButtonDemo01.class.getResource("4.png");
Icon icon = new ImageIcon(resource);
//单选框
JRadioButton jrb01 = new JRadioButton("jrb01");
JRadioButton jrb02 = new JRadioButton("jrb02");
JRadioButton jrb03 = new JRadioButton("jrb03");
//由于单选框只能选择一个,分组
ButtonGroup buttonGroup = new ButtonGroup();
buttonGroup.add(jrb01);
buttonGroup.add(jrb02);
buttonGroup.add(jrb03);
contentPane.add(jrb01,BorderLayout.CENTER);
contentPane.add(jrb02,BorderLayout.NORTH);
contentPane.add(jrb03,BorderLayout.SOUTH);
this.setVisible(true);
this.setBounds(100,100,400,300);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new JButtonDemo02();
}
}
复选按钮
package com.wang.lesson5;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
public class JButtonDemo03 extends JFrame {
public JButtonDemo03(){
Container contentPane = this.getContentPane();
//图片变为图标
URL resource = JButtonDemo01.class.getResource("4.png");
Icon icon = new ImageIcon(resource);
//多选框
JCheckBox jcb1 = new JCheckBox("jcb1");
JCheckBox jcb2 = new JCheckBox("jcb2");
JCheckBox jcb3 = new JCheckBox("jcb3");
//流式布局
contentPane.setLayout(new FlowLayout(FlowLayout.LEFT));
contentPane.add(jcb1);
contentPane.add(jcb2);
contentPane.add(jcb3);
//东西南北中布局
/*
contentPane.add(jcb1,BorderLayout.NORTH);
contentPane.add(jcb2,BorderLayout.CENTER);
contentPane.add(jcb3,BorderLayout.SOUTH);
*/
this.setVisible(true);
this.setBounds(100,100,400,300);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new JButtonDemo03();
}
}
6.列表
下拉框
package com.wang.lesson6;
import javax.swing.*;
import java.awt.*;
public class TestComboboxDemo01 extends JFrame {
public TestComboboxDemo01(){
Container container = this.getContentPane();
JComboBox status = new JComboBox();
status.addItem("未上映");
status.addItem("正在热映");
status.addItem("已下架");
container.add(status);
this.setVisible(true);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
this.setBounds(100,100,500,400);
}
public static void main(String[] args) {
new TestComboboxDemo01();
}
}
列表框
应用场景:
- 选择地区,或者一些单个选项
- 列表,展示信息,一般是动态扩展
package com.wang.lesson6;
import javax.swing.*;
import java.awt.*;
import java.util.Vector;
public class TestComboboxDemo02 extends JFrame {
public TestComboboxDemo02(){
Container container = this.getContentPane();
//生成列表的内容
// String[] contents = {"1","2","3"};
//列表中需要的内容
Vector contents = new Vector();
JList jList = new JList(contents);
JList jList1 = new JList(contents);
contents.add("2222");
contents.add("333");
container.add(jList);
this.setVisible(true);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
this.setBounds(100,100,500,400);
}
public static void main(String[] args) {
new TestComboboxDemo02();
}
}
7.文本框
文本框
package com.wang.lesson6;
import javax.swing.*;
import java.awt.*;
public class TestTextDemo01 extends JFrame {
public TestTextDemo01(){
Container container = this.getContentPane();
//不布局只会出现WORLD,且位置不对
this.setLayout(new FlowLayout(FlowLayout.RIGHT));
JTextField jTextField1 = new JTextField("HELLO");
JTextField jTextField2 = new JTextField("WORLD",20);
container.add(jTextField1);
container.add(jTextField2);
this.setVisible(true);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
this.setBounds(100,100,400,300);
}
public static void main(String[] args) {
new TestTextDemo01();
}
}
密码框
package com.wang.lesson6;
import javax.swing.*;
import java.awt.*;
public class TestTextDemo02 extends JFrame {
public TestTextDemo02(){
Container container = this.getContentPane();
JPasswordField jPasswordField = new JPasswordField();//---
jPasswordField.setEchoChar('-');
container.add(jPasswordField);
this.setVisible(true);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
this.setBounds(100,100,400,300);
}
public static void main(String[] args) {
new TestTextDemo02();
}
}
文本域
//文本域
JTextArea jTextArea = new JTextArea(20, 50);
jTextArea.setText("学习学习");
//面板 并添加到contentpane
contentPane.add(new JScrollPane(jTextArea));
后记
Java全栈学习路线可参考:【Java全栈学习路线】最全的Java学习路线及知识清单,Java自学方向指引,内含最全Java全栈学习技术清单~
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