一个JAVA小程序，计算器的

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package javatest;

import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class calculatorface extends JFrame{
/**
每次用时都要按下clear按钮，然后就是小数点按钮我没有处理，做的不是太好，里面除运算无法计算到小数
*/
private static final long serialVersionUID = 1581029666853134020L;
ArrayList<String> al = new ArrayList<String>();
JButton jb1 = new JButton("1");
JButton jb2 = new JButton("2");
JButton jb3 = new JButton("3");
JButton jb4 = new JButton("4");
JButton jb5 = new JButton("5");
JButton jb6 = new JButton("6");
JButton jb7 = new JButton("7");
JButton jb8 = new JButton("8");
JButton jb9 = new JButton("9");
JButton jb0 = new JButton("0");
JButton jbxing = new JButton("*");
JButton jbdian = new JButton(".");
JButton jbjian = new JButton("-");
JButton jbjia = new JButton("+");
JButton jbchu = new JButton("/");
JButton jbdeng = new JButton("=");
JButton jbC = new JButton("Clear");
public JLabel jl = new JLabel("0.",JLabel.RIGHT);
public calculatorface(){
super("计算器");
init();
}
public void init(){
Container c = getContentPane();
JPanel jp1 = new JPanel();
JPanel jp2 = new JPanel();
JPanel jp3 = new JPanel();
JPanel jp4 = new JPanel();
JPanel jp5 = new JPanel();
JPanel jp6 = new JPanel();
/*设定容器的布局方式*/
jp1.setLayout(new GridLayout(1,1));
jp2.setLayout(new GridLayout(1,4));
jp3.setLayout(new GridLayout(1,4));
jp4.setLayout(new GridLayout(1,4));
jp5.setLayout(new GridLayout(1,4));
jp6.setLayout(new GridLayout(1,4));
c.setLayout(new GridLayout(6,1));
/*将文本域放入容器jp1*/
jp1.add(jl);
/*将按钮放入容器jp2*/
jp2.add(jb7);
jp2.add(jb8);
jp2.add(jb9);
jp2.add(jbchu);
/*

text.setEditable(false);// 得写到方法体中去，单独是不能存在的，你看来是写得头晕了哈
第二个类那样是用不了text.setText();的
没有这个对象，你把它们写到同一个类中去就没问题了。
非要这么写，那你得再写个方法将text对象传递出来在第二个类中获取来使用……

你写得有点儿乱，我也不知道怎么改了！写一个太花时间，我这边给你一个吧！

你说按钮距离那就是你布局没有处理好！建议直接像下面给出的程序那样！也简单

出了问题了不怕，问题越多进步越快哈

有问题你可以加这个群进行提问：5358308，java world!(two)

给你一个计算器程序

//第一个类是GUI，两个类放两文件里去
import javax.swing.*;
import java.awt.Container;
import java.awt.event.*;

public class Calculate_GUI extends JFrame{
private JPanel p1;
private JButton keyButton[]=new JButton[16],signButton,clearButton,deleteButton;
private JTextField outputField;
private Container contentPane;
private boolean firstInput=true;
private Calculate_Model model=new Calculate_Model();

public Calculate_GUI(){
p1=new JPanel();
keyButton[0]=new JButton("1"); //创建各个按钮
keyButton[1]=new JButton("2");
keyButton[2]=new JButton("3");
keyButton[3]=new JButton("/");
keyButton[4]=new JButton("4");
keyButton[5]=new JButton("5");
keyButton[6]=new JButton("6");
keyButton[7]=new JButton("*");
keyButton[8]=new JButton("7");
keyButton[9]=new JButton("8");
keyButton[10]=new JButton("9");
keyButton[11]=new JButton("-");
keyButton[12]=new JButton("0");
keyButton[13]=new JButton(".");
keyButton[14]=new JButton("=");
keyButton[15]=new JButton("+");
clearButton=new JButton("c");
signButton=new JButton("+/-");
deleteButton=new JButton("←");
outputField=new JTextField(); //它允许编辑单行文本
outputField.setText("0");
outputField.setEditable(false); //指示此 TextComponent 是否应该为可编辑的
contentPane=this.getContentPane(); //返回此窗体的 contentPane 对象;

this.setSize(250,250);
p1.setLayout(new java.awt.GridLayout(4,5)); //创建具有4行5列的布局

for(int i=0;i<keyButton.length;i++) //在容器中画上按钮
{
if(i==4) p1.add(deleteButton);
if(i==8) p1.add(clearButton);
if(i==12) p1.add(signButton);
keyButton[i].setFont(new java.awt.Font("Dialog",3,15));//设置字体Dialog字体名，样式,大小
p1.add(keyButton[i]);
}

contentPane