题目要求
实现加、减、乘和除运算。输入两个参数后，点击按钮加、减、乘或除，则执行相应的计算，结果显示在计算结果后的文本域中。
代码示例
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Test{
public static void main(String[] args){
Calculator c = new Calculator();
c.setTitle("简易计算器");
c.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
c.setVisible(true);
}
}
class Calculator extends JFrame{
public Calculator(){
setSize(300, 200);
setLayout(new FlowLayout());
JPanel jp1 = new JPanel();
JPanel jp2 = new JPanel();
JPanel jp3 = new JPanel();
JPanel jp4 = new JPanel();
JLabel jl1 = new JLabel("第一个参数：");
JTextField jtf1 = new JTextField(10);
jp1.add(jl1);
jp1.add(jtf1);
JLabel jl2 = new JLabel("第二个参数：");
JTextField jtf2 = new JTextField(10);
jp2.add(jl2);
jp2.add(jtf2);
JLabel jl3 = new JLabel(" 计算结果：");
JTextField jtf3 = new JTextField(10);
jp3.add(jl3);
jp3.add(jtf3);
JButton jb1 = new JButton("加");
jb1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
double p1 = Double.parseDouble(jtf1.getText());
double p2 = Double.parseDouble(jtf2.getText());
double p3 = p1+p2;
String answer = ""+p3;
jtf3.setText(answer);
}
});
JButton jb2 = new JButton("减");
jb2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
double p1 = Double.parseDouble(jtf1.getText());
double p2 = Double.parseDouble(jtf2.getText());
double p3 = p1-p2;
String answer = ""+p3;
jtf3.setText(answer);
}
});
JButton jb3 = new JButton("乘");
jb3.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
double p1 = Double.parseDouble(jtf1.getText());
double p2 = Double.parseDouble(jtf2.getText());
double p3 = p1*p2;
String answer = ""+p3;
jtf3.setText(answer);
}
});
JButton jb4 = new JButton("除");
jb4.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
double p1 = Double.parseDouble(jtf1.getText());
double p2 = Double.parseDouble(jtf2.getText());
if(p2!=0) {
double p3 = p1/p2;
String answer = ""+p3;
jtf3.setText(answer);
}
else {
JOptionPane.showMessageDialog(Calculator.this, "第二个参数为0","报错提示",JOptionPane.WARNING_MESSAGE);
}
}
});
jp4.add(jb1);jp4.add(jb2);jp4.add(jb3);jp4.add(jb4);
add(jp1);
add(jp2);add(jp3);add(jp4);
}
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