编程

public class Counter extends JFrame implements ActionListener{

/**
* Comment for serialVersionUID
*/
private static final long serialVersionUID = -1379168350413982454L;

TextField num1;
TextField num2;
TextField result;
JButton clear;
JButton plus;
JTextArea j1;
JTextArea j2;
JButton aa;
public Counter(){

num1 = new TextField(5);//定义加数1
num2 = new TextField(5);//定义加数2
result = new TextField(5);//定义结果
plus=new JButton("加");//定义加法按钮
clear = new JButton("清空");//定义清空按钮
j1 = new JTextArea("+");//定义符号 +
j2 = new JTextArea("=");//定义符号 =
j1.setEditable(false);//定义属性只读
j2.setEditable(false);//定义加数1
result.setEditable(false);//定义加数1
aa = new JButton("隐藏");
this.add(num1);
this.add(j1);
this.add(num2);
this.add(j2);
this.add(result);
this.add(plus);
this.add(clear);
this.add(aa);

this.setLayout(new FlowLayout());
this.setBackground(Color.white);
this.setVisible(true);
this.setSize(500,200);
this.setTitle("计算器");
this.setLocationRelativeTo(null);//窗口初始位置在中间
plus.addActionListener(this);
clear.addActionListener(this);
aa.addActionListener(this);
this.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}

public void actionPerformed(ActionEvent e){

if (e.getSource()==clear){//点击清空按钮
num1.setText("");
num2.setText("");
result.setText("");
}else if(e.getSource()==plus){//点击“加”按钮
result.setText(Integer.parseInt(num1.getText())+Integer.parseInt(num2.getText())+"");
}else if(e.getSource()==aa){
aa.setVisible(false);
}
}

public static void main(String[] args) {
new Counter();
}
/**
* 判断输入的是否是数字
* @param str
* @return
*/
public static boolean isInt(String str){
try {
Integer.parseInt(str);
} catch (Exception e) {
return false;
}
return true;
}
}

给我你的邮箱 我发一份最全的给你 我的QQ号是357981751