java图形界面简易计算器
界面效果：
/**
*
*/
package calculator;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import java.awt.GridLayout;
import javax.swing.JLabel;
import java.awt.GridBagLayout;
import javax.swing.JTextField;
import java.awt.GridBagConstraints;
import java.awt.FlowLayout;
import javax.swing.SpringLayout;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Font;
import javax.swing.JSpinner;
import javax.swing.JFormattedTextField;
import javax.swing.JCheckBox;
import javax.swing.JTable;
import javax.swing.JProgressBar;
import javax.swing.JTextArea;
import java.awt.Color;
/**
* @author Ocean
*
*/
public class Calc_Main extends JFrame {
private JTextField textField;
private JTable table;
String s = "";// 显示算式
long[] num = new long[100];// 储存运算数据
char[] b = new char[100];// 储存运算符
int i = 0;// 输入运算数据和运算符是给数组计数
int c;// 计算结果时计数
long jieguo = 0;// 计算结果
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Calc_Main frame = new Calc_Main();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* 构造方法
* Create the frame.
*/
public Calc_Main() {
setFont(new Font("Dialog", Font.PLAIN, 12));
setTitle("计算器");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(800, 300, 382, 494);
getContentPane().setLayout(null);
textField = new JTextField();
textField.setForeground(new Color(102, 51, 255));
textField.setFont(new Font("宋体", Font.PLAIN, 18));
textField.setBounds(10, 10, 344, 50);
getContentPane().add(textField);
textField.setColumns(10);
JButton btnNewButton = new JButton("C");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
s="";
textField.setText(s);//清空文本框
for(c=0;c<100;c++)
{
num[c]=0;//清空运算数据
b[c]=0;//清空运算符
}
i=0;
c=0;
jieguo=0;
}
});
btnNewButton.setBounds(20, 99, 65, 40);
getContentPane().add(btnNewButton);
JButton button = new JButton("/");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
s=s+"/";
textField.setText(s);//在文本框中显示相应运算符
b[i]='/';
i++; //输入运算符号后给数组地址+1存放后面的输入
}
});
button.setBounds(107, 99, 65, 40);
getContentPane().add(button);
JButton button_1 = new JButton("*");
button_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
s=s+"*";
textField.setText(s);//在文本框中显示相应运算符
b[i]='*';
i++;
}
});
button_1.setBounds(189, 99, 65, 40);
getContentPane().add(button_1);
JButton button_2 = new JButton("-");
button_2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
s=s+"-";
textField.setText(s);//在文本框中显示相应运算符
b[i]='-';
i++;
}
});
button_2.setBounds(276, 99, 65, 40);
getContentPane().add(button_2);
JButton button_3 = new JButton("1");
button_3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
s += "1";
textField.setText(s);//在文本框中显示相应数字
num[i] = num[i] * 10 + 1;
}
});
button_3.setBounds(20, 170, 65, 40);
getContentPane().add(button_3);
JButton button_4 = new JButton("2");
button_4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
s += "2";
textField.setText(s);//在文本框中显示相应数字
num[i] = num[i] * 10 + 2;
}
});
button_4.setBounds(107, 170, 65, 40);
getContentPane().add(button_4);
JButton button_5 = new JButton("3");
button_5.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
s += "3";
textField.setText(s);//在文本框中显示相应数字
num[i] = num[i] * 10 + 3;
}
});
button_5.setBounds(189, 170, 65, 40);
getContentPane().add(button_5);
JButton button_6 = new JButton("+");
button_6.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
s=s+"+";
textField.setText(s);//在文本框中显示相应运算符
b[i]='+';
i++;
}
});
button_6.setBounds(276, 170, 65, 116);
getContentPane().add(button_6);
JButton button_7 = new JButton("4");
button_7.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
s += "4";
textField.setText(s);//在文本框中显示相应数字
num[i] = num[i] * 10 + 4;
}
});
button_7.setBounds(20, 246, 65, 40);
getContentPane().add(button_7);
JButton button_8 = new JButton("5");
button_8.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
s += "5";
textField.setText(s);//在文本框中显示相应数字
num[i] = num[i] * 10 + 5;
}
});
button_8.setBounds(107, 246, 65, 40);
getContentPane().add(button_8);
JButton button_9 = new JButton("6");
button_9.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
s += "6";
textField.setText(s);//在文本框中显示相应数字
num[i] = num[i] * 10 + 6;
}
});
button_9.setBounds(189, 246, 65, 40);
getContentPane().add(button_9);
JButton button_11 = new JButton("7");
button_11.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
s += "7";
textField.setText(s);//在文本框中显示相应数字
num[i] = num[i] * 10 + 7;
}
});
button_11.setBounds(20, 315, 65, 40);
getContentPane().add(button_11);
JButton button_12 = new JButton("8");
button_12.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
s += "8";
textField.setText(s);//在文本框中显示相应数字
num[i] = num[i] * 10 + 8;
}
});
button_12.setBounds(107, 315, 65, 40);
getContentPane().add(button_12);
JButton button_13 = new JButton("9");
button_13.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
s += "9";
textField.setText(s);//在文本框中显示相应数字
num[i] = num[i] * 10 + 9;
}
});
button_13.setBounds(189, 315, 65, 40);
getContentPane().add(button_13);
JButton button_14 = new JButton("=");
button_14.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
switch(b[0])//为了方便用循环来计算，我想到的是先把第一次计算提出来
{
case '+':
{
jieguo=num[0]+num[1];
break;
}
case '-':
{
jieguo=num[0]-num[1];
break;
}
case '*':
{
jieguo=num[0]*num[1];
break;
}
case '/':
{
jieguo=num[0]/num[1];
break;
}
}
c++;
// 一个算式多次运算
for(c=1;c<i;c++)
{
switch(b[c])
{
case '+':
{
jieguo=jieguo+num[c+1];
break;
}
case '-':
{
jieguo=jieguo-num[c+1];
break;
}
case '*':
{
jieguo=jieguo*num[c+1];
break;
}
case '/':
{
jieguo=jieguo/num[c+1];
break;
}
}
}
textField.setText(String.valueOf(jieguo));//.setText()的参数需要String，所以用String.valueOf()将long转换为String
}
});
button_14.setBounds(276, 315, 65, 104);
getContentPane().add(button_14);
JButton button_15 = new JButton("0");
button_15.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
s += "0";
textField.setText(s);//在文本框中显示相应数字
num[i] = num[i] * 10 + 0;
}
});
button_15.setBounds(20, 379, 152, 40);
getContentPane().add(button_15);
JButton button_17 = new JButton(".");
button_17.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//还没想出来怎么整，有知道的大佬还请多指教``
}
});
button_17.setBounds(189, 379, 65, 40);
getContentPane().add(button_17);
JLabel label = new JLabel("注意本计算机没有计算优先级（一律从左到右计算）");
label.setBounds(22, 430, 321, 15);
getContentPane().add(label);
}
}
本文作者：大海&
本文链接：https://www.cnblogs.com/oceanus/p/12860484.html
本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。
