做的项目里面有一个是计算器的。做得比较简单，只是普通的加减乘除等于小数点负号删除退格等，其他功能如科学计算、进制转换，其实难度也不大，就是懒得去弄那些。整个程序可以说是自己独立完成的吧，因为没什么花哨，无非就是运算时条件多弄点，让程序不出BUG。

    周末在家设置了一下字体和输入框，搞大了点，看着也舒服了点。当然，这界面很普通，没啥特色。整个代码也没啥特色，刚开始写了些，其他的就复制，回来才发现代码太多了，不过懒得改，所以整个代码也没用到方法。这完全是一大败笔，所以，没打算用这个当毕业答辩。嘿嘿，有一点还好，就是暂时没发现BUG。

    不说了，贴上去代码：

package org.ckw;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class Test2 {

static void f(){

}

static String s="";

static String s1="";

static double d2=0;

static double sum=0;

static int a=0;

static int a1=0;

public static void main(String[] args) {

JFrame jf=new JFrame("计算器");

final JTextField jtf=new JTextField(30);//文本框

jtf.setHorizontalAlignment(jtf.RIGHT);//右对齐

jtf.setFont(new Font(null, Font.PLAIN, 30));

jtf.setText("0");

JPanel jp0=new JPanel();

jp0.setLayout(new BorderLayout());

jp0.add(jtf);

JPanel jp=new JPanel();

jp.setLayout(new GridLayout(4,4,3,3));

JPanel jp1=new JPanel();

jp1.setLayout(new GridLayout(1,2,3,3));

JButton b1=new JButton("1");

b1.setFont(new Font(null, Font.PLAIN, 15));

b1.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

jtf.setText(s+"1");

s=s+"1";

}

});

JButton b2=new JButton(s+"2");

b2.setFont(new Font(null, Font.PLAIN, 15));

b2.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

jtf.setText(s+"2");

s=s+"2";

}

});

JButton b3=new JButton("3");

b3.setFont(new Font(null, Font.PLAIN, 15));

b3.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

jtf.setText(s+"3");

s=s+"3";

}

});

JButton b4=new JButton("4");

b4.setFont(new Font(null, Font.PLAIN, 15));

b4.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

jtf.setText(s+"4");

s=s+"4";

}

});

JButton b5=new JButton("5");

b5.setFont(new Font(null, Font.PLAIN, 15));

b5.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

jtf.setText(s+"5");

s=s+"5";

}

});

JButton b6=new JButton("6");

b6.setFont(new Font(null, Font.PLAIN, 15));

b6.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

jtf.setText(s+"6");

s=s+"6";

}

});

JButton b7=new JButton("7");

b7.setFont(new Font(null, Font.PLAIN, 15));

b7.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

jtf.setText(s+"7");

s=s+"7";

}

});

JButton b8=new JButton("8");

b8.setFont(new Font(null, Font.PLAIN, 15));

b8.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

jtf.setText(s+"8");

s=s+"8";

}

});

JButton b9=new JButton("9");

b9.setFont(new Font(null, Font.PLAIN, 15));

b9.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

jtf.setText(s+"9");

s=s+"9";

}

});

JButton b0=new JButton("0");

b0.setFont(new Font(null, Font.PLAIN, 16));

b0.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

jtf.setText(s+"0");

s=s+"0";

}

});

JButton bdeng=new JButton("=");

bdeng.setBackground(Color.ORANGE);

bdeng.setFont(new Font(null, Font.PLAIN, 24));

bdeng.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

if(s.length()>0^(s.length()==1&&s.indexOf(‘-‘) == 0)){

if(a==1){

sum+=Double.parseDouble(jtf.getText());;

}else if(a==2){

sum-=Double.parseDouble(jtf.getText());;

}else if(a==3){

sum*=Double.parseDouble(jtf.getText());;

}else if(a==4){

sum/=Double.parseDouble(jtf.getText());;

}else{

sum=Double.parseDouble(jtf.getText());

}

jtf.setText(""+sum);

s="";

a=0;

a1=1;

}

}

});

JButton bjia=new JButton("+");

bjia.setFont(new Font(null, Font.PLAIN, 16));

bjia.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

if(s.length()>0||a1==1){

if(a==1){

sum+=Double.parseDouble(jtf.getText());

}else if(a==2){

sum-=Double.parseDouble(jtf.getText());;

}else if(a==3){

sum*=Double.parseDouble(jtf.getText());;

}else if(a==4){

sum/=Double.parseDouble(jtf.getText());;

}else{

sum=Double.parseDouble(jtf.getText());

}

jtf.setText(""+sum);

s="";

a=1;

a1=0;

}

}

});

JButton bjian=new JButton("-");

bjian.setFont(new Font(null, Font.PLAIN, 16));

bjian.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

if(s.length()>1||(s.length()>0&&jtf.getText().indexOf("-")!=0||a1==1)){

if(a==1){

sum+=Double.parseDouble(jtf.getText());

}else if(a==2){

sum-=Double.parseDouble(jtf.getText());

}else if(a==3){

sum*=Double.parseDouble(jtf.getText());

}else if(a==4){

sum/=Double.parseDouble(jtf.getText());

}else{

sum=Double.parseDouble(jtf.getText());

}

jtf.setText(""+sum);

s="";

a=2;

a1=0;

}

if(jtf.getText().length()==1&&jtf.getText().indexOf("0")==0){

if(jtf.getText().indexOf("-")==0){

System.out.println(123);

}else{

jtf.setText("-");

s="-";

}

}

}

});

JButton bceng=new JButton("x");

bceng.setFont(new Font(null, Font.PLAIN, 16));

bceng.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

if(s.length()>0||a1==1){

if(a==1){

sum+=Double.parseDouble(jtf.getText());

}else if(a==2){

sum-=Double.parseDouble(jtf.getText());;

}else if(a==3){

sum*=Double.parseDouble(jtf.getText());;

}else if(a==4){

sum/=Double.parseDouble(jtf.getText());;

}else{

sum=Double.parseDouble(jtf.getText());

}

jtf.setText(""+sum);

s="";

a=3;

a1=0;

}

}

});

JButton bchu=new JButton("÷");

bchu.setFont(new Font(null, Font.PLAIN, 16));

bchu.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

if(s.length()>0||a1==1){

if(a==1){

sum+=Double.parseDouble(jtf.getText());

}else if(a==2){

sum-=Double.parseDouble(jtf.getText());;

}else if(a==3){

sum*=Double.parseDouble(jtf.getText());;

}else if(a==4){

sum/=Double.parseDouble(jtf.getText());;

}else{

sum=Double.parseDouble(jtf.getText());

}

jtf.setText(""+sum);

s="";

a=4;

a1=0;

}

}

});

JButton bdian=new JButton(".");

bdian.setFont(new Font(null, Font.PLAIN, 16));

bdian.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

if(s.indexOf(‘.‘) < 0){

jtf.setText(s+".");

s=s+".";

}

}

});

JButton bsan=new JButton("C");

bsan.setForeground(Color.RED);

bsan.setFont(new Font(null, Font.PLAIN, 16));

bsan.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

jtf.setText("0");

sum=0;

s="";

}

});

JButton btui=new JButton("DEL");

btui.setForeground(Color.ORANGE);

btui.setFont(new Font(null, Font.PLAIN, 14));

btui.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

if (jtf.getText().length()>0) {

jtf.setText(jtf.getText().substring(0, jtf.getText().length()-1));

s=jtf.getText();

}

if (jtf.getText().length()==0) {

jtf.setText("0");

}

}

});

jp.add(bsan);jp.add(btui);jp.add(bchu);jp.add(bceng);

jp.add(b7);jp.add(b8);jp.add(b9);jp.add(bjia);

jp.add(b4);jp.add(b5);jp.add(b6);jp.add(bjian);

jp.add(b1);jp.add(b2);jp.add(b3);jp.add(bdian);

jp1.add(b0);jp1.add(bdeng);

jf.add(BorderLayout.NORTH, jp0);

jf.add(BorderLayout.CENTER, jp);

jf.add(BorderLayout.SOUTH, jp1);

jf.setVisible(true);

jf.setBounds(200, 200, 400, 300);

jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

}

JAVA编写的一个简单的计算器