Java多功能计算器小程序（附界面）
早期写的计算器，现在看来还是挺粗糙的，各个控件应该用数组来初始化和排版，懒得改凑合看吧。功能挺全的，求根加减乘除百分制删除清空，和实体简易计算器几乎一致
package calculator;
import java.awt.*
import javax.swing.*
public class CalculatorJPanel extends JFrame implements ActionListener{
private JTextField text_show;
private JButton button_sqrt,button_mark,button_CE,button_C,
button_7,button_8,button_9,button_divide,
button_4,button_5,button_6,button_multiply,
button_1,button_2,button_3,button_minus,
button_0,button_dot,button_equal,button_plus;
private JPanel jpanel;
private char sign;
private double v1;
private double v2;
private boolean reop;
public CalculatorJPanel(){
this.setTitle("计算器");
this.setBounds(700,400,300,324);
this.setBackground(Color.lightGray);
this.setFont(new Font("Arial",Font.BOLD,18));
JFrame f=new JFrame();
f.setLayout(new BorderLayout());
text_show=new JTextField("",100);
jpanel=new JPanel();
Container container=getContentPane();
container.add(text_show, BorderLayout.NORTH);
container.add(jpanel, BorderLayout.CENTER);
text_show.setEditable(false);
text_show.setHorizontalAlignment(JTextField.RIGHT);
jpanel.setLayout(new GridLayout(5,4));
button_sqrt=new JButton("sqrt");button_mark=new JButton("%");
button_CE=new JButton("CE");button_C=new JButton("C");
button_7=new JButton("7");button_8=new JButton("8");
button_9=new JButton("9");button_divide=new JButton("/");
button_4=new JButton("4");button_5=new JButton("5");
button_6=new JButton("6");button_multiply=new JButton("*");
button_1=new JButton("1");button_2=new JButton("2");
button_3=new JButton("3");button_minus=new JButton("-");
button_0=new JButton("0");button_dot=new JButton(".");
button_equal=new JButton("=");button_plus=new JButton("+");
button_sqrt.addActionListener(this);
button_mark.addActionListener(this);
button_CE.addActionListener(this);
button_C.addActionListener(this);
button_7.addActionListener(this);
button_8.addActionListener(this);
button_9.addActionListener(this);
button_divide.addActionListener(this);
button_4.addActionListener(this);
button_5.addActionListener(this);
button_6.addActionListener(this);
button_multiply.addActionListener(this);
button_1.addActionListener(this);
button_2.addActionListener(this);
button_3.addActionListener(this);
button_minus.addActionListener(this);
button_0.addActionListener(this);
button_dot.addActionListener(this);
button_equal.addActionListener(this);
button_plus.addActionListener(this);
jpanel.add(button_sqrt);
jpanel.add(button_mark);
jpanel.add(button_CE);
jpanel.add(button_C);
jpanel.add(button_7);
jpanel.add(button_8);
jpanel.add(button_9);
jpanel.add(button_divide);
jpanel.add(button_4);
jpanel.add(button_5);
jpanel.add(button_6);
jpanel.add(button_multiply);
jpanel.add(button_1);
jpanel.add(button_2);
jpanel.add(button_3);
jpanel.add(button_minus);
jpanel.add(button_0);
jpanel.add(button_dot);
jpanel.add(button_equal);
jpanel.add(button_plus);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
public void actionPerformed(ActionEvent ev){
double value=0;
char operator=0;
if(reop)
{
text_show.setText("");
reop = false;
}
if(ev.getSource()==button_0){
String str=text_show.getText();
if(str.equals(""))
return;
text_show.setText(str+'0');
}
if(ev.getSource()==button_1){
String str=text_show.getText();
text_show.setText(str+'1');
}
if(ev.getSource()==button_2){
String str=text_show.getText();
text_show.setText(str+'2');
}
if(ev.getSource()==button_3){
String str=text_show.getText();
text_show.setText(str+'3');
}
if(ev.getSource()==button_4){
String str=text_show.getText();
text_show.setText(str+'4');
}
if(ev.getSource()==button_5){
String str=text_show.getText();
text_show.setText(str+'5');
}
if(ev.getSource()==button_6){
String str=text_show.getText();
text_show.setText(str+'6');
}
if(ev.getSource()==button_7){
String str=text_show.getText();
text_show.setText(str+'7');
}
if(ev.getSource()==button_8){
String str=text_show.getText();
text_show.setText(str+'8');
}
if(ev.getSource()==button_9){
String str=text_show.getText();
text_show.setText(str+'9');
}
if(ev.getSource()==button_dot){
String str=text_show.getText();
text_show.setText(str+'.');
}
if(ev.getSource()==button_C){
text_show.setText("");
return;
}
if(ev.getSource()==button_plus){
operator='+';
}
if(ev.getSource()==button_minus){
operator='-';
}
if(ev.getSource()==button_multiply){
operator='*';
}
if(ev.getSource()==button_divide){
operator='/';
}
if(ev.getSource()==button_equal){
operator='=';
}
if(ev.getSource()==button_mark){
operator='%';
}
if(ev.getSource()==button_sqrt){
operator='^';
}
if(ev.getSource()==button_CE){
operator='e';
}
switch(operator){
case'e' :
String s=text_show.getText();
text_show.setText(s.substring(0,s.length()-1));
break;
case'^' :
v1=Double.parseDouble(text_show.getText());
value=Math.sqrt(v1);text_show.setText(String.valueOf(value));reop = true;
break;
case'%' :
v1=Double.parseDouble(text_show.getText());
value=v1/100;text_show.setText(String.valueOf(value));reop = true;
break;
case'+' :
v1=Double.parseDouble(text_show.getText());
text_show.setText("");sign='+';break;
case'-' :
v1=Double.parseDouble(text_show.getText());
text_show.setText("");sign='-';break;
case'*' :
v1=Double.parseDouble(text_show.getText());
text_show.setText("");sign='*';break;
case'/' :
v1=Double.parseDouble(text_show.getText());
text_show.setText("");sign='/';break;
case'=' :
reop = true;
v2=Double.parseDouble(text_show.getText());
switch(sign){
case'+' :
value=v1+v2;break;
case'-' :
value=v1-v2;break;
case'*' :
value=v1*v2;break;
case'/' :
value=v1/v2;break;
default:value=v1;
}
String str=String.valueOf(value);
text_show.setText(str);
break;
default:;
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
new CalculatorJPanel();
}
}
版权声明：本文为博主原创文章，博客地址：http://blog.csdn.net/qq_37808895，未经博主允许不得转载。
程序结果图 如下
![Java小案例——随机数猜测随机数猜测[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)