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);
		
	}
}