java计算器源码

java计算器源码

String op2 = "0";//用来保存数据2
double end = 0.0;
String operator = "+";//用来保存运算符
boolean append = true;//是否是追加
//定义需要的组件
TextField tf = null;
Panel p1 = null;
Button tg = null;
Button qk = null;
Panel p2 = null;
String[] s = {"7","8","9","+",
"4","5","6","-",
"1","2","3","*",
"0",".","/","="};
Button[] b = new Button[16];
public MyCaculator(){
//初始化组件
tf = new TextField(30);
// p1 = new Panel();
// p1.setLayout(new FlowLayout(FlowLayout.RIGHT));
p1 = new Panel(new FlowLayout(FlowLayout.RIGHT));//流式布局，居右对齐
tg = new Button("退格");
qk = new Button("清空");
tg.addActionListener(this);
qk.addActionListener(this);
p1.add(tg);
p1.add(qk);
p2 = new Panel(new GridLayout(4,4,5,5));
for(int i = 0;i<b.length;i++){
b[i] = new Button(s[i]);
b[i].addActionListener(this);
p2.add(b[i]);
}
//设置背景
this.setBackground(Color.GRAY);
//设置字体
this.setFont(new Font("黑体",Font.BOLD+Font.ITALIC,15));
//设置标题
this.setTitle("我的计算器");
this.add(tf,BorderLayout.NORTH);
this.add(p1);
this.add(p2,BorderLayout.SOUTH);
this.pack();
//关闭窗口
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
this.setVisible(true);

}
public void actionPerformed(ActionEvent e) {
String comm = e.getActionCommand();
//1.数字
if("0123456789".indexOf(comm)!=-1){
if(append){
String temp = tf.getText();//取出tf中的内容
tf.setText(temp+comm);//将你点击的数据加到取出的内容中，再一次性输出
}else{
tf.setText(comm);
append = true;
}
}//2.处理运算符
else if("+-*/".indexOf(comm)!=-1){
op1 = tf.getText();//保存点击操作符前的数据1
append = false;
operator = comm;//保存操作符
}
//3.处理等号
else if("=".equals(comm)){
op2 = tf.getText();//保存点击操作符前的数据2
//使用包装类，将字符串转换为基本数据类型
double d1 = Double.parseDouble(op1);
double d2 = Double.parseDouble(op2);
if(operator.equals("+")){
end = d1+d2;
}else if(operator.equals("-")){
end = d1-d2;
}else if(operator.equals("*")){
end = d1*d2;
}else if(operator.equals("/")){
end = d1/d2;
}
tf.setText(end+"");
}
//4.小数点
else if(comm.equals(".")){
String temp = tf.getText();
tf.setText(temp+".");
append = true;
}else if(comm.equals("退格")){
String temp = tf.getText();
if(temp.length()>0){
tf.setText(temp.substring(0,temp.length()-1));
}
}else if(comm.equals("清空")){
tf.setText("");
}
}
public static void main(String[] args){
new MyCaculator();
}

}