java 编写的计算器源代码

可以实现四则运算及三角函数和乘方等预算

Java Swing 编写计算器 源代码

import java.awt.Button;

import java.awt.Color;

import java.awt.Frame;

import java.awt.GridLayout;

import java.awt.Panel;

import java.awt.TextField;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import javax.swing.JFrame;

import

public class Counter extends Frame {

// 声明三个面板的布局

GridLayout gl1, gl2, gl3,gl4;

Panel p0, p1, p2, p3,p4;

JTextField tf1;

TextField tf2;

Button b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14,b15, b16, b17, b18, b19, b20, b21, b22, b23, b24, b25, b26,b27,b28,b29,b30;

StringBuffer str;// 显示屏所显示的字符串

double x, y;// x和y都是运算数

double sum=0;//加和

double mul=1;//乘积

double sub=0;//减差 令其为输入的第一个值

double dev;//除商 令其为输入的第一个值

boolean tag= true;

boolean tag1= true;

int z = -1,k;// Z表示单击了那一个运算符.0表示"+",1表示"-",2表示"*",3表示"/"

static double m ;// 记忆的数字

public Counter() {

gl1 = new GridLayout(1, 4, 10, 0);// 实例化三个面板的布局 gl2 = new GridLayout(4, 1, 0, 15);

gl3 = new GridLayout(4, 5, 10, 15);

gl4 = new GridLayout(1, 4, 10, 0);