diff --git a/src/java2022spring/Calculator.java b/src/java2022spring/Calculator.java
new file mode 100644
index 0000000000000000000000000000000000000000..76536353306b36e01c2b0ea3aa23228e3bdacb72
--- /dev/null
+++ b/src/java2022spring/Calculator.java
@@ -0,0 +1,595 @@
+package java2022spring;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+
+public class Calculator extends JFrame implements ActionListener
+    {  
+       JTextArea memoryArea=new JTextArea(" ",1,5);
+       JTextArea process=new JTextArea(" ",1,20);
+       JTextArea dispresult=new JTextArea("0.   ",1,30);
+       Font font1=new Font("Vani",Font.BOLD,30 );
+       Font font2=new Font("Arial Rounded MT  Bold",Font.PLAIN,10 );
+       Font font3=new Font("Arial Rounded MT  Bold",Font.PLAIN,20 );
+       Font font4=new Font("Vani",Font.PLAIN,15);
+
+       JButton[]jbuttons=new JButton[32];
+       
+       double result=0,first=0,second=0; 
+       double memery=0;
+       char firstsymbol='\0',secondsymbol='\0';
+       boolean prev=true,repeat=true,dot=true;
+     Calculator()
+    {
+	       super("Calculator");
+	       this.setTitle("计算器");
+	       try
+	       {  
+	    	   UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
+	       } catch(Exception e)
+	       {
+	           System.out.println(e);
+	       }
+	       JPanel resultField=new JPanel();
+	       resultField.setLayout(new GridLayout(3,1));
+	       
+	       JPanel buttonField=new JPanel();
+	       Container all=getContentPane();
+	
+	       GridLayout grid1;
+	       grid1=new GridLayout(8,4,0,0);
+	
+	       memoryArea.setFont(font3);
+	       dispresult.setFont(font3);
+	       process.setFont(font4);
+	       memoryArea.setEditable(false);
+	       process.setEditable(false);
+	       dispresult.setEditable(false);
+	      
+	
+	       resultField.add(memoryArea);
+	       resultField.add(process);
+	       resultField.add(dispresult);
+	       
+	       all.add(resultField,"North");
+	       
+	       String[]buttonname={"MS","MC","MR","M+","1/x","x2","√","㏒","%","sin","cos","tan","CE","C","back","÷","7","8","9","×","4","5","6","－","1","2","3","＋","±","0",".","＝"};
+	
+	       buttonField.setLayout(grid1);
+	       buttonField.setBackground(Color.gray);
+	       for(int i=0;i<4;i++)
+		   {
+	    	   
+		    	   for(int j=0;j<8;j++)
+			       {
+		    		   jbuttons[i*8+j]=new JButton(buttonname[i*8+j]);
+			           jbuttons[i*8+j].addActionListener(this);
+			           jbuttons[i*8+j].setBackground(Color.LIGHT_GRAY );
+			           buttonField.add(jbuttons[i*8+j]);  
+			           jbuttons[j].setBorder(BorderFactory.createRaisedBevelBorder());
+			           
+			       	}
+	       }
+	       for(int j=0;j<4;j++){
+	    	   jbuttons[j].setFont(font2);
+	    	   jbuttons[j].setBackground(new Color(250,250,250));
+	    	   jbuttons[j].setPreferredSize(new Dimension(40,40));
+	    	   jbuttons[j].setBorder(BorderFactory.createRaisedBevelBorder());
+	       }
+	       for(int j=4;j<16;j++){
+	    	   jbuttons[j].setFont(font4);
+	    	   jbuttons[j].setBorder(BorderFactory.createRaisedBevelBorder());
+	    
+	       }
+	       for(int j=16;j<32;j++){
+	    	   jbuttons[j].setFont(font1);
+	    	   jbuttons[j].setBorder(BorderFactory.createRaisedBevelBorder());
+	    	  
+	       }
+	       jbuttons[15].setFont(font4);
+	       jbuttons[19].setFont(font4);
+	
+	       all.add(buttonField,"Center");
+	       setSize(422,405);
+	       setResizable(true);
+	       setVisible(true);
+	       //this.setResizable(false);
+	       this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+     }
+     public void pressNumber(String n)
+     {
+     	process.setText(process.getText()+n);
+     	if(prev)
+     	{
+     		dispresult.setText(n);
+     		prev=false;
+     	}
+     	else dispresult.append(n);
+     }
+     public boolean divide(double d)
+     {
+     	if(d==0)
+     	{
+     		dispresult.setText("除数不能为0!");
+     		prev=true;
+     		repeat=true;
+     		firstsymbol='\0';
+     		secondsymbol='\0';
+     		return true;
+     	}
+     	return false;
+     }
+     public void actionPerformed(ActionEvent e)
+     {   
+     		Object source=e.getSource();
+     		if(source==jbuttons[12])
+     		{
+     			dispresult.setText("0.");
+     			dot=true;
+     			prev=true;
+     			repeat=true;
+     			return;
+     		}
+     		
+     		if(source==jbuttons[13])
+     		{
+     			process.setText(null);
+     			dispresult.setText("0.");
+     			firstsymbol='\0';
+     			secondsymbol='\0';
+     			prev=true;
+     			repeat=true;
+     			dot=true;
+     			return;
+     		}
+     		if(source==jbuttons[14]){
+     			String text=process.getText();
+     			int i=text.length();
+     			if(i>0){
+     				text=text.substring(0,i-1);
+     				if(text.length()==0){
+     						dispresult.setText("0.");
+     						process.setText("");
+     						firstsymbol='\0';
+     						secondsymbol='\0';
+     						first=second=0;
+     						prev=true;
+     						repeat=true;
+     						dot=true;
+     				}
+     				else{
+     					dispresult.setText(text);
+     					process.setText(text);
+     				}
+     				
+     			}
+     		}
+     		if(source==jbuttons[1])
+     		{
+     			memery=0;
+     			memoryArea.setText(" ");
+     			prev=true;
+     			repeat=false;
+     			dot=true;
+     			return;
+     		}
+     		if(source==jbuttons[29])
+     		{
+     			pressNumber("0");
+     			repeat=false;
+     			return;
+     		}
+     		if(source==jbuttons[24])
+     		{
+     			pressNumber("1");
+     			repeat=false;
+     			return;
+     		}
+     		if(source==jbuttons[25])
+     		{
+     			pressNumber("2"); 
+     			repeat=false;
+     			return;
+     		}
+     		if(source==jbuttons[4])
+     	    {
+     				double temp=1/Double.parseDouble(dispresult.getText());
+     				dispresult.setText(String.valueOf(temp));
+     				prev=true;
+     				repeat=false;
+     				dot=true;
+     				return;
+     	    }
+     		if(source==jbuttons[5])
+     	    {
+     				double temp=Double.parseDouble(dispresult.getText())*Double.parseDouble(dispresult.getText());
+     				dispresult.setText(String.valueOf(temp));
+     				prev=true;
+     				repeat=false;
+     				dot=true;
+     				return;
+     	    }
+     		if(source==jbuttons[6])
+     	    {
+     				
+     				if(-Double.parseDouble(dispresult.getText())<0){
+     					double temp=Math.sqrt(Double.parseDouble(dispresult.getText()));
+     					dispresult.setText(String.valueOf(temp));
+     					prev=true;
+     					repeat=false;
+     					dot=true;
+     					return;
+     				}else{
+     					dispresult.setText("请输入有效数字");
+     				}
+     				
+     	    }
+     		if(source==jbuttons[7])
+    	    {
+    				
+    				if(-Double.parseDouble(dispresult.getText())<0){
+    					double temp=Math.log10(Double.parseDouble(dispresult.getText()));
+    					dispresult.setText(String.valueOf(temp));
+    					prev=true;
+    					repeat=false;
+    					dot=true;
+    					return;
+    				}else{
+    					dispresult.setText("请输入有效数字");
+    				}
+    				
+    	    }
+    		if(source==jbuttons[8])
+    	    {
+    				double temp=Double.parseDouble(dispresult.getText())/100;
+    				dispresult.setText(String.valueOf(temp));
+    				prev=true;
+    				repeat=false;
+    				dot=true;
+    				return;
+    	    }
+    		 if(source==jbuttons[9])
+    	     {
+    				double temp=Math.sin(Double.parseDouble(dispresult.getText()));
+    				dispresult.setText(String.valueOf(temp));
+    				prev=true;
+    				repeat=false;
+    				dot=true;
+    				return;
+    	     }
+    		if(source==jbuttons[10])
+    		{
+    			double temp=Math.cos(Double.parseDouble(dispresult.getText()));
+    			dispresult.setText(String.valueOf(temp));
+    			prev=true;
+    			repeat=false;
+    			dot=true;
+    			return;
+    		}
+    		if(source==jbuttons[2])
+    		{
+    			if(memoryArea.getText().equals(" M "))
+    			  dispresult.setText(String.valueOf(memery));
+    			prev=true;
+    			repeat=false;
+    			dot=true;
+    			return;
+    		}
+            if(source==jbuttons[26])
+            {
+                    pressNumber("3");
+                    repeat=false;
+                    return;
+            }  
+            if(source==jbuttons[20])
+            {
+                    pressNumber("4");
+                    repeat=false;
+                    return;
+            }
+            if(source==jbuttons[21])
+            {
+                    pressNumber("5");
+                    repeat=false;
+                    return;
+            }
+            if(source==jbuttons[11])
+            {
+    			double temp=Math.tan(Double.parseDouble(dispresult.getText()));
+    			dispresult.setText(String.valueOf(temp));
+    			prev=true;
+    			repeat=false;
+    			dot=true;
+    			return;
+            }
+            if(source==jbuttons[0])
+            {
+                memery=Double.parseDouble(dispresult.getText());
+    			if(memery!=0)memoryArea.setText("M");
+    			prev=true;
+    			repeat=false;
+    			dot=true;
+    			return;
+            }
+            if(source==jbuttons[22])
+            {
+                    pressNumber("6");
+                    repeat=false;
+                    return;
+            }
+
+
+    		if(source==jbuttons[16])
+    		{   pressNumber("7");
+    		    repeat=false;
+    		    return;
+    		}
+    		if(source==jbuttons[17])
+    		{   pressNumber("8");
+    		    repeat=false;
+    		    return;}
+    		if(source==jbuttons[28])
+    		{   double temp=-Double.parseDouble(dispresult.getText());
+    		    dispresult.setText(String.valueOf(temp));
+    		    prev=true;
+    		    repeat=false;
+    		    dot=true;
+    		    return;}
+    		if(source==jbuttons[3])
+    		{   memery+=-Double.parseDouble(dispresult.getText());
+    		    if(memery!=0) memoryArea.setText("M");
+    		    prev=true;
+    		    repeat=false;
+    		    dot=true;
+    		    return;}
+    		if(source==jbuttons[18])
+    		{   pressNumber("9");
+    		    repeat=false;
+    		    return;
+    		  }
+    		if(source==jbuttons[30])
+    		{   if(dot){
+    		    pressNumber(".");
+    		    dot=false;
+    		    repeat=false;
+    		  }
+    		   return;
+    		}
+
+    		if(source==jbuttons[31])
+    		{
+    		  second=Double.parseDouble(dispresult.getText());
+    		  dot=true;
+    		  switch(secondsymbol)
+    		  {
+    		      case'*':
+    		        second*=first;
+    		        break;
+    		      case'/':
+    		        if(divide(second))  return;
+    		        second=first/second;
+    		   }//end of switch(secondsymbol)
+    		   secondsymbol='\0';
+    		   switch(firstsymbol)
+    		   {
+    		      case'+':
+    		         result+=second;
+    		         break;
+    		      case'-':
+    		         result-=second;
+    		         break;
+    		      case'*':
+    		         result*=second;
+    		         dispresult.setText(String.valueOf(result));
+    		         break;
+    		      case'/':
+    		         if(divide(second))   return;
+    		         result/=second;
+    		    }
+    		    if(firstsymbol!='\0') dispresult.setText(String.valueOf(result));
+    		    firstsymbol='\0';
+    		    prev=true;
+    		    repeat=false;
+    		    return;
+    		}
+    		if(source==jbuttons[27])
+    		{
+    			process.setText(process.getText()+"+");
+    			dot=true;
+    			if(repeat){
+    				firstsymbol='+';
+    				return;
+    				
+    			}
+    			second=Double.parseDouble(dispresult.getText());
+    			switch(secondsymbol){
+    				case'*':
+    					second*=first;
+    					break;
+    				case'/':
+    					if(divide(second))return;
+    					second=first/second;
+    			}
+    			secondsymbol='\0';
+    			switch(firstsymbol){
+    			case'\0':
+    				result=second;
+    				firstsymbol='+';
+    				break;
+    			case'+':
+    				result+=second;
+    				dispresult.setText(String.valueOf(result));
+    				break;
+    			case'-':
+    				result-=second;
+    				firstsymbol='+';
+    				dispresult.setText(String.valueOf(result));
+    				break;
+    			case'*':
+    				result*=second;
+    				firstsymbol='+';
+    				dispresult.setText(String.valueOf(result));
+    				break;
+    			case'/':
+    				if(divide(second))return;
+    				result/=second;
+    				firstsymbol='+';
+    				dispresult.setText(String.valueOf(result));
+    				
+    			}
+    			prev=true;
+    			repeat=true;
+    			return;
+    		}
+    		if(source==jbuttons[23])
+    		{
+    			process.setText(process.getText()+"-");
+    			dot=true;
+    			if(repeat){
+    				firstsymbol='-';
+    				return;
+    			}
+    			second=Double.parseDouble(dispresult.getText());
+    			switch(secondsymbol){
+    			case'*':
+    				second*=first;
+    				break;
+    			case'/':
+    				if(divide(second))return;
+    				second=first/second;
+    				
+    			}
+    			secondsymbol='\0';
+    			switch(firstsymbol){
+    			case'\0':
+    				result=second;
+    				firstsymbol='-';
+    				break;
+    			case'+':
+    				result=second;
+    				firstsymbol='-';
+    				dispresult.setText(String.valueOf(result));
+    				break;
+    			case'-':
+    				result-=second;
+    				dispresult.setText(String.valueOf(result));
+    				break;
+    			case'*':
+    				result*=second;
+    				firstsymbol='-';
+    				dispresult.setText(String.valueOf(result));
+    				break;
+    			case'/':
+    				if(divide(second))return;
+    				result/=second;
+    				firstsymbol='-';
+    				dispresult.setText(String.valueOf(result));
+    				
+    			}
+    			prev=true;
+    			repeat=true;
+    			return;
+    			}
+    		if(source==jbuttons[19])
+    		{
+    			process.setText(process.getText()+"*");
+    			dot=true;
+    			if(repeat){
+    				if(secondsymbol=='\0')firstsymbol='*';
+    				else secondsymbol='*';
+    				return;
+    			}
+    			second=Double.parseDouble(dispresult.getText());
+    			switch(secondsymbol){
+    			case'\0':
+    				switch(firstsymbol){
+    				case'\0':
+    					firstsymbol='*';
+    					result=second;
+    					break;
+    				case'+':
+    				case'-':
+    					first=second;
+    					secondsymbol='*';
+    					break;
+    				case'*':
+    					result*=second;
+    					dispresult.setText(String.valueOf(result));
+    					break;
+    				case'/':
+    					if(divide(second))return;
+    					result/=second;
+    					dispresult.setText(String.valueOf(result));
+    					firstsymbol='*';
+    				}
+    				break;
+    			case'*':
+    				first*=second;
+    				dispresult.setText(String.valueOf(first));
+    				break;
+    			case'/':
+    				if(divide(second))return;
+    				first/=second;
+    				secondsymbol='*';
+    				dispresult.setText(String.valueOf(first));
+    			}
+    			prev=true;
+    			repeat=true;
+    			return;
+    		}
+    		if(source==jbuttons[15])
+    		{
+    			process.setText(process.getText()+"/");
+    			dot=true;
+    			if(repeat){
+    				if(secondsymbol=='\0')firstsymbol='/';
+    				else secondsymbol='/';
+    				return;
+    			}
+    			second=Double.parseDouble(dispresult.getText());
+    			switch(secondsymbol){
+    			case'\0':
+    				switch(firstsymbol){
+    				case'\0':
+    					firstsymbol='/';
+    					result=second;
+    					break;
+    				case'+':
+    				case'-':
+    					first=second;
+    					secondsymbol='/';
+    					break;
+    				case'*':
+    					result*=second;
+    					firstsymbol='/';
+    					dispresult.setText(String.valueOf(result));
+    					break;
+    				case'/':
+    					if(divide(second))return;
+    					result/=second;
+    					dispresult.setText(String.valueOf(result));
+    				}
+    				break;
+    			case'*':
+    				first*=second;
+    				secondsymbol='/';
+    				dispresult.setText(String.valueOf(first));
+    				break;
+    			case'/':
+    				if(divide(second))return;
+    				first/=second;
+    				dispresult.setText(String.valueOf(first));
+    			}
+    			prev=true;
+    			repeat=true;
+    			return;
+    		}
+    }
+
+	public static void main(String args[])
+	{
+		Calculator mc=new Calculator();
+	}
+}      
+