设计一个基于 Swing 的简单计算器，用于整数的加减乘除运算。

港控/mmm° 2023-01-16 14:21 149阅读 0赞

效果图：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTcwNTc4Mw_size_16_color_FFFFFF_t_70]  
采用边界布局与网格布局相结合的方式，完成计算器的组件布局。在处理事件过程中，需考虑对于运算过程中异常处理，如除法分母不为 0、提供的运算字符串无法运算等异常情况的提示。

public class Calculator { 
    	public static void main(String args[]) { 
    	      WindowOperation win=new WindowOperation();
    	      
    	      win.setTitle("Calculator");
    	      win.setLocationRelativeTo(null);
    	   }
    }

import java.awt.GridLayout;
    import java.awt.*;
    import javax.swing.event.AncestorListener;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    
    import javax.swing.*;
    
    
    import java.io.*;
    public class WindowOperation extends JFrame { 
    	double inputNumberOne;
        double inputNumberTwo;
        double result;
        int Fuhao=-1;
        StringBuilder sBuilder = new StringBuilder();
       
       public WindowOperation() { 
          init();
          setVisible(true);
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       }
       
       void init() { 
    	   JPanel panel = new JPanel();
    	   setBounds(100,100,300,200);
    	   JButton btn[];
    
    	   String str[]= { "0","1","2","3","4","5","6","7","8","9","+","-","*","/","C","="};
    	   panel.setLayout(new GridLayout(4,4));
    	   btn=new JButton[str.length];
    	   for(int i=0;i<str.length;i++) { 
    		   btn[i]=new JButton(str[i]);
    		   panel.add(btn[i]);
    	   }
    
    	   JTextField txt=new JTextField("0");//文本框
    	   txt.setHorizontalAlignment(JTextField.LEFT);
    	   add(txt,"North");
    	   add(panel);
    	   setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    	   
    	   //给各个按钮设置动作监听器
    	   btn[0].addActionListener(new ActionListener() { 
    		   public void actionPerformed(ActionEvent e) { 
    			   sBuilder.append("0");
    			   txt.setText(sBuilder.toString());
    		   }
    		   });
    	   btn[1].addActionListener(new ActionListener() { 
    		   public void actionPerformed(ActionEvent e) { 
    			   sBuilder.append("1");
    			   txt.setText(sBuilder.toString());
    		   }
    		   });
    	   btn[2].addActionListener(new ActionListener() { 
    		   public void actionPerformed(ActionEvent e) { 
    			   sBuilder.append("2");
    			   txt.setText(sBuilder.toString());
    		   }
    		   });
    	   btn[3].addActionListener(new ActionListener() { 
    		   public void actionPerformed(ActionEvent e) { 
    			   sBuilder.append("3");
    			   txt.setText(sBuilder.toString());
    		   }
    		   });
    	   btn[4].addActionListener(new ActionListener() { 
    		   public void actionPerformed(ActionEvent e) { 
    			   sBuilder.append("4");
    			   txt.setText(sBuilder.toString());
    		   }
    		   });
    	   btn[5].addActionListener(new ActionListener() { 
    		   public void actionPerformed(ActionEvent e) { 
    			   sBuilder.append("5");
    			   txt.setText(sBuilder.toString());
    		   }
    		   });
    	   btn[6].addActionListener(new ActionListener() { 
    		   public void actionPerformed(ActionEvent e) { 
    			   sBuilder.append("6");
    			   txt.setText(sBuilder.toString());
    		   }
    		   });
    	   btn[7].addActionListener(new ActionListener() { 
    		   public void actionPerformed(ActionEvent e) { 
    			   sBuilder.append("7");
    			   txt.setText(sBuilder.toString());
    		   }
    		   });
    	   btn[8].addActionListener(new ActionListener() { 
    		   public void actionPerformed(ActionEvent e) { 
    			   sBuilder.append("8");
    			   txt.setText(sBuilder.toString());
    		   }
    		   });
    	   btn[9].addActionListener(new ActionListener() { 
    		   public void actionPerformed(ActionEvent e) { 
    			   sBuilder.append("9");
    			   txt.setText(sBuilder.toString());
    		   }
    		   });
    	   //"+","-","*","/","C","="
    	   btn[10].addActionListener(new ActionListener() { 
    		   public void actionPerformed(ActionEvent e) { 
    			   inputNumberOne=Double.parseDouble(sBuilder.toString());
    			   sBuilder = new StringBuilder();
    			   if(Fuhao!=-1) { 
    				   txt.setText("输入符号不符合要求");
    			   }
    			   else { 
    				   txt.setText("+");
    				   Fuhao=0;
    			   }
    		   }
    		   });
    	   btn[11].addActionListener(new ActionListener() { 
    		   public void actionPerformed(ActionEvent e) { 
    			   inputNumberOne=Double.parseDouble(sBuilder.toString());
    			   sBuilder = new StringBuilder();
    			   if(Fuhao!=-1) { 
    				   txt.setText("输入符号不符合要求");
    			   }
    			   else { 
    				   txt.setText("-");
    				   Fuhao=1;
    			   }
    		   }
    		   });
    	   btn[12].addActionListener(new ActionListener() { 
    		   public void actionPerformed(ActionEvent e) { 
    			   inputNumberOne=Double.parseDouble(sBuilder.toString());
    			   sBuilder = new StringBuilder();
    			   if(Fuhao!=-1) { 
    				   txt.setText("输入符号不符合要求");
    			   }
    			   else { 
    				   txt.setText("*");
    				   Fuhao=2;
    			   }
    		   }
    		   });
    	   btn[13].addActionListener(new ActionListener() { 
    		   public void actionPerformed(ActionEvent e) { 
    			   inputNumberOne=Double.parseDouble(sBuilder.toString());
    			   sBuilder = new StringBuilder();
    			   if(Fuhao!=-1) { 
    				   txt.setText("输入符号不符合要求");
    			   }
    			   else { 
    				   txt.setText("/");
    				   Fuhao=3;
    			   }
    		   }
    		   });
    	   btn[14].addActionListener(new ActionListener() { 
    		   public void actionPerformed(ActionEvent e) { 
    			   sBuilder = new StringBuilder();
    			   txt.setText("0");
    		   }
    		   });
    	   btn[15].addActionListener(new ActionListener() { 
    		   public void actionPerformed(ActionEvent e) { 
    			   // 该判断中间变量是否为空
    			   if (!"".equals(sBuilder.toString())) { 
    				   inputNumberTwo=Double.parseDouble(sBuilder.toString());
    				   sBuilder.append("=");
    				   txt.setText(sBuilder.toString());
    				   if(Fuhao==0) { 
    					   result=inputNumberOne+inputNumberTwo;
    					   txt.setText(String.valueOf(result));
    					   sBuilder = new StringBuilder();
    					   sBuilder.append(result);
    				   }
    				   else if(Fuhao==1) { 
    					   result=inputNumberOne-inputNumberTwo;
    					   txt.setText(String.valueOf(result));
    					   sBuilder = new StringBuilder();
    					   sBuilder.append(result);
    				   }
    				   else if(Fuhao==2) { 
    					   result=inputNumberOne*inputNumberTwo;
    					   txt.setText(String.valueOf(result));
    					   sBuilder = new StringBuilder();
    					   sBuilder.append(result);
    				   }
    				   else if(Fuhao==3) { 
    					   if(inputNumberTwo==0) { 
    						   sBuilder = new StringBuilder();
    						   txt.setText("被除数不可为0");
    					   }
    					   else { 
    						   result=inputNumberOne/inputNumberTwo;
    						   txt.setText(String.valueOf(result));
    						   sBuilder = new StringBuilder();
    						   sBuilder.append(result);
    					   }
    				   }
    				   else { 
    					   sBuilder = new StringBuilder();
    					   txt.setText("输入符号不符合要求");
    				   }
    				   Fuhao=-1;
    		   }
    		   }
    		   });
    	   
    	   
       }
    }

[源码][Link 1]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTcwNTc4Mw_size_16_color_FFFFFF_t_70]: /images/20221022/56ddbabc70404623b3b346c87e730513.png
[Link 1]: https://download.csdn.net/download/weixin_45705783/18116987