diff --git a/src/java2020spring/Calculator.java b/src/java2020spring/Calculator.java
new file mode 100644
index 0000000000000000000000000000000000000000..28d609d721243a4d72da8efeea954e1699e4a1fc
--- /dev/null
+++ b/src/java2020spring/Calculator.java
@@ -0,0 +1,396 @@
+package java2020spring;
+import java.awt.Color;
+import java.awt.EventQueue;
+import java.awt.event.*;
+import javax.swing.*;
+import javax.swing.border.EmptyBorder;
+import java.awt.Font;
+import java.awt.GridLayout;
+
+@SuppressWarnings("serial")
+public class Calculator extends JFrame implements ActionListener {
+	private JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b21,b22,b23,b24,b25;
+    double x,y;    /*运算数x,y*/
+    int z;
+    double sum;  /*阶乘结果数*/
+    double s;   /*乘Π运算结果数*/
+    int flag=0;  /*标志变量*/
+	StringBuffer str=new StringBuffer();    /*建立字符缓冲区*/
+	private JTextField resultText=new JTextField("0") ;   /*显示结果文本框*/
+	
+	public static void main(String[] args) {
+		EventQueue.invokeLater(new Runnable() {
+			public void run() {
+				try {
+					Calculator frame = new Calculator();
+					frame.setVisible(true);
+				} catch (Exception e) {
+					e.printStackTrace();
+				}
+			}
+		});
+	}
+	/**
+	 * Create the frame.
+	 */
+	public Calculator() {
+		getContentPane().setBackground(Color.WHITE);         /*初始化计算器页面，结果文本框颜色字体以及按钮初始化*/
+		getContentPane().setForeground(new Color(255, 250, 205));
+		getContentPane().setLayout(new GridLayout(2, 0, 25, 20));
+		setBounds(400, 200, 250, 200);
+		setBackground(Color.WHITE);
+		setSize(466,486);
+		setTitle("球球的计算器");
+		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		
+		resultText.setEditable(false);
+		resultText.setBackground(Color.WHITE);
+		resultText.setFont(new Font("华文细黑", Font.BOLD, 42));
+		resultText.setHorizontalAlignment(SwingConstants.RIGHT);
+		resultText.setSize(46,86);
+		resultText.setBorder(new EmptyBorder(5, 0, 2, 2));
+		getContentPane().add(resultText);
+	
+        JPanel p1 = new JPanel();
+        p1.setBackground(Color.WHITE);
+		p1.setSize(400,400);
+		p1.setLayout(new GridLayout(5, 5, 2, 3));
+		p1.setBorder(new EmptyBorder(0, 0, 0, 0));
+		getContentPane().add(p1);
+		
+		b1 = new JButton("\uFF0B");
+		b1.setForeground(new Color(0, 0, 0));
+		b1.setBackground(Color.WHITE);
+		b1.setFont(new Font("华文楷体", Font.BOLD, 27));
+		
+		b2 = new JButton("\uFE63");
+		b2.setForeground(new Color(0, 0, 0));
+		b2.setBackground(Color.WHITE);
+	    b2.setFont(new Font("楷体", Font.BOLD, 42));
+	    
+	    b3 = new JButton("C");
+		b3.setBackground(Color.WHITE);
+		b3.setFont(new Font("华文细黑", Font.BOLD, 27));
+		b3.setForeground(new Color(0, 0, 0));
+		
+		b4 = new JButton("\u2190");
+		b4.setFont(new Font("幼圆", Font.BOLD, 33));
+		b4.setBackground(Color.WHITE);
+		
+	    b5 = new JButton("7");
+		b5.setFont(new Font("幼圆", Font.BOLD, 33));
+		
+		b6 = new JButton("8");
+		b6.setFont(new Font("幼圆", Font.BOLD, 33));
+		
+		b7 = new JButton("9");
+		b7.setFont(new Font("幼圆", Font.BOLD, 33));
+		
+		b8 = new JButton("×");
+		b8.setBackground(Color.WHITE);
+		b8.setFont(new Font("华文楷体", Font.BOLD, 29));
+		
+		b9 = new JButton("4");
+		b9.setFont(new Font("幼圆", Font.BOLD, 33));
+		
+		b10 = new JButton("5");
+		b10.setFont(new Font("幼圆", Font.BOLD, 33));
+		
+		b11 = new JButton("6");
+		b11.setFont(new Font("幼圆", Font.BOLD, 33));
+		
+		b12 = new JButton("\u00F7");
+		b12.setBackground(Color.WHITE);
+		b12.setFont(new Font("幼圆", Font.BOLD, 33));
+		
+		b13 = new JButton("1");
+		b13.setFont(new Font("幼圆", Font.BOLD, 33));
+		
+		b14 = new JButton("2");
+		b14.setFont(new Font("幼圆", Font.BOLD, 33));
+		
+        b15 = new JButton("3");
+		b15.setFont(new Font("幼圆", Font.BOLD, 33));
+		
+		b16 = new JButton("\u221A");
+		b16.setBackground(Color.WHITE);
+		b16.setFont(new Font("幼圆", Font.BOLD, 29));
+		
+		b17 = new JButton("-/+");
+		b17.setFont(new Font("华文宋体", Font.BOLD, 30));
+		
+		b18 = new JButton("0");
+		b18.setFont(new Font("幼圆", Font.BOLD, 33));
+		
+		b19 = new JButton(".");
+		b19.setFont(new Font("幼圆", Font.BOLD, 35));
+		
+		b20 = new JButton("=");
+		b20.setBackground(Color.WHITE);
+		b20.setForeground(new Color(0, 0, 0));
+		b20.setFont(new Font("华文楷体", Font.BOLD, 36));
+		
+		b21 = new JButton("%");
+		b21.setBackground(Color.WHITE);
+		b21.setFont(new Font("华文楷体", Font.BOLD, 25));
+		
+		b22 = new JButton("!");
+		b22.setBackground(Color.WHITE);
+		b22.setFont(new Font("华文楷体", Font.BOLD, 31));
+		
+		b23 = new JButton("x\u00B2");
+		b23.setBackground(Color.WHITE);
+		b23.setFont(new Font("华文楷体", Font.BOLD, 28));
+		
+		b24 = new JButton("1/x");
+		b24.setBackground(Color.WHITE);
+		b24.setFont(new Font("华文楷体", Font.BOLD, 26));
+		
+		b25 = new JButton("\u03C0");
+		b25.setBackground(Color.WHITE);
+		b25.setFont(new Font("华文楷体", Font.BOLD, 30));
+		
+		p1.add(b21);p1.add(b1);p1.add(b2);p1.add(b3);p1.add(b4);p1.add(b22);p1.add(b5);
+		p1.add(b6);p1.add(b7);p1.add(b8);p1.add(b23);p1.add(b9);p1.add(b10);p1.add(b11);p1.add(b12);p1.add(b24);
+		p1.add(b13);p1.add(b14);p1.add(b15);p1.add(b16);p1.add(b25);p1.add(b17);p1.add(b18);p1.add(b19);p1.add(b20);
+
+		/*注册监听器*/
+		 b1.addActionListener(this);b2.addActionListener(this); 
+		 b3.addActionListener(this); b4.addActionListener(this); 
+		 b5.addActionListener(this); b6.addActionListener(this); 
+		 b7.addActionListener(this); b8.addActionListener(this);
+		 b9.addActionListener(this); b10.addActionListener(this); 
+		 b11.addActionListener(this); b12.addActionListener(this); 
+		 b13.addActionListener(this); b14.addActionListener(this); 
+		 b15.addActionListener(this); b16.addActionListener(this);
+		 b17.addActionListener(this); b18.addActionListener(this); 
+		 b19.addActionListener(this); b20.addActionListener(this); 
+		 b21.addActionListener(this); b22.addActionListener(this); 
+		 b23.addActionListener(this); b24.addActionListener(this); b25.addActionListener(this);
+	}
+	/*实现按钮*/
+	public void actionPerformed(ActionEvent e) {
+		try {
+			 /*清除键C操作*/
+			if(e.getSource()==b3) {   
+				y=0d;
+				x=0d;
+				s=0d;
+				sum=0d;
+				flag=0;
+				z=13;
+				resultText.setText("0");
+			    str.setLength(0);	
+			}
+			/*加负号操作*/
+			else if(e.getSource()==b17) {                         
+				x=Double.parseDouble(resultText.getText().trim()); 
+				if(x==0.0) {                                 /*若显示屏为零则不用给0加负号*/ 
+					resultText.setText("0");
+					resultText.setHorizontalAlignment(JTextField.RIGHT); 
+				}
+				else {
+				resultText.setText(""+(-x)); 
+				z=12;
+				resultText.setHorizontalAlignment(JTextField.RIGHT); 
+			}
+		   }
+			/*连加与加法操作*/ 
+			else if(e.getSource()==b1) {    
+				if(flag==0) {
+					 x=Double.parseDouble(resultText.getText().trim());flag=1;
+				}
+				else { 
+					x=x+y; 
+					y=0d;
+			   } 
+			   z=0;
+			   str.setLength(0);
+			}
+			/*连减和减法操作*/
+			else if(e.getSource()==b2) {                          
+				if(flag==0) {
+					 x=Double.parseDouble(resultText.getText().trim());flag=1;
+				}
+				else { 
+					x=x-y;
+					y=0d;
+			}  
+			 z=1; 
+			 str.setLength(0);  
+			}
+			 /*连乘和乘法操作*/
+			 else if(e.getSource()==b8) {                   			 
+				 if(flag==0) {
+					 x=Double.parseDouble(resultText.getText().trim());flag=1;
+				}
+				 else { 
+				 x=x*y;
+				 y=0d;
+				}
+				 z=2; 
+				 str.setLength(0); 
+			 }
+			 /*连除和除法操作*/
+			else if(e.getSource()==b12) {                  
+				if(flag==0) {
+					 x=Double.parseDouble(resultText.getText().trim());flag=1;
+				}
+				else{
+				 x=x/y;
+				y=0d;
+			  }
+				z=3; 
+				str.setLength(0); 
+			}
+			/*平方运算*/
+			else if(e.getSource()==b23) {
+				x=Double.parseDouble(resultText.getText().trim()); 
+			    x=x*x;
+			    resultText.setText(""+x);
+			    str.setLength(0);
+			    y=0d; 
+				z=4; 
+			}
+			/*百分号运算*/
+			else if(e.getSource()==b21) {
+			    x=Double.parseDouble(resultText.getText().trim());
+			    x=x/100; 
+			    resultText.setText(""+x);
+			    str.setLength(0);
+				y=0d; 
+				z=5;
+			}
+			/*阶乘运算*/
+			else if(e.getSource()==b22) {
+				double num=Double.parseDouble(resultText.getText());
+				if(num>0) {
+				sum=1.0;
+				while(num>1.0) {
+					sum=sum*num;
+					num=num-1.0;
+				 }
+				resultText.setText(""+sum);
+				}
+				else {if(num==0) {
+					sum=1;
+					resultText.setText(""+sum);
+				}
+				else { 
+					resultText.setText("负数不可以阶乘");
+				}
+				}
+				z=6;
+				y=0d;
+				str.setLength(0);
+			}
+			 /*开根号运算*/
+			else if(e.getSource()==b16) {                                
+			  x=Double.parseDouble(resultText.getText().trim()); 
+			  if(x==0) {
+				  resultText.setText("0");
+			  }
+			  else if(x<0) {
+					resultText.setText("根号下不能为负数");
+					 resultText.setHorizontalAlignment(JTextField.RIGHT); 
+				}
+			 else {
+				 resultText.setText(""+Math.sqrt(x));
+				 z=7;
+			}
+			 str.setLength(0); 
+			 y=0d; 
+		}
+			/*1/x运算*/
+			else if(e.getSource()==b24) { 
+			  x=Double.parseDouble(resultText.getText().trim()); 
+			  if(x==0) {
+				  resultText.setText("分母不能为0");
+				  z=15;
+			 }
+			  else {
+				  resultText.setText(""+(1/x));
+				  z=8;
+			  }
+			y=0d; 
+			str.setLength(0);  
+			}
+			/*乘Π运算*/
+			else if(e.getSource()==b25) {
+				 s=Double.parseDouble(resultText.getText().trim());
+				 s=s*Math.PI;
+			    resultText.setText(""+s) ;
+				z=9;
+				y=0d;
+				str.setLength(0); 
+			}
+			/*单击等号输出结果*/
+			else if(e.getSource()==b20) {  
+				 str.setLength(0);  
+			switch(z) {
+			case 0: resultText.setText(""+(x+y));flag=0;resultText.setHorizontalAlignment(JTextField.RIGHT);break; 
+			 case 1:resultText.setText(""+(x-y));flag=0;resultText.setHorizontalAlignment(JTextField.RIGHT);break; 
+			 case 2:resultText.setText(""+(x*y));flag=0;resultText.setHorizontalAlignment(JTextField.RIGHT);break; 
+			 case 3:resultText.setText(""+(x/y));flag=0;resultText.setHorizontalAlignment(JTextField.RIGHT);break;
+			 case 4:resultText.setText(""+x);resultText.setHorizontalAlignment(JTextField.RIGHT);break;
+			 case 5:resultText.setText(""+x);resultText.setHorizontalAlignment(JTextField.RIGHT);break;
+			 case 6:if(sum==0) {
+				 resultText.setText("负数不可以阶乘");
+				 }
+			 else{
+				 resultText.setText(""+sum);
+				 resultText.setHorizontalAlignment(JTextField.RIGHT);
+				 }
+			 break;
+			 case 7:resultText.setText(""+Math.sqrt(x));resultText.setHorizontalAlignment(JTextField.RIGHT);break;
+			 case 8:resultText.setText(""+(1/x));resultText.setHorizontalAlignment(JTextField.RIGHT);break;
+			 case 9:resultText.setText(""+s);resultText.setHorizontalAlignment(JTextField.RIGHT);break;
+			 default:resultText.setText(resultText.getText());break;
+			} 
+		}
+			/*小数点运算*/
+			else if(e.getSource()==b19) {
+				if(resultText.getText().trim().indexOf('.')!=-1) {  } /*判断字符串中是否已经包含了小数点，有即不操作*/ 
+				else {                                                      /*如果没有小数点*/
+				 if(resultText.getText().trim().equals("0")) {         /*如果初时显示为0*/
+					 resultText.setText(str.append(e.getActionCommand()).toString()); 
+					 resultText.setHorizontalAlignment(JTextField.RIGHT); 
+				 } 
+				 else {
+					 resultText.setText(str.append(e.getActionCommand()).toString());
+					 resultText.setHorizontalAlignment(JTextField.RIGHT); 
+				 } 
+				 }
+				y=0d; 
+		}
+			 /*回退键操作*/
+		     else if (e.getSource()==b4)  {                            
+			  if(!resultText.getText().trim().equals("0")) {     /*如果显示屏显示的不是零*/
+			  if(str.length()!=1) {
+				  resultText.setText(str.delete(str.length()-1,str.length()).toString());
+				  resultText.setHorizontalAlignment(JTextField.RIGHT); 
+				 } 
+			 else { 
+			      resultText.setText("0"); resultText.setHorizontalAlignment(JTextField.RIGHT); 
+				  str.setLength(0); 
+				  } 
+		     } 
+				 y=Double.parseDouble(resultText.getText().trim()); 
+				 } 
+		    /*按其他数字键直接输出结果框就好了*/
+		     else                                              
+				 { 
+					 resultText.setText(str.append(e.getActionCommand()).toString()); 
+					 resultText.setHorizontalAlignment(JTextField.RIGHT); 
+				     y=Double.parseDouble(resultText.getText().trim()); 
+				 } 
+		 } 
+		/*若出现数字格式异常则提醒用户*/ 
+		 catch(NumberFormatException e1){ resultText.setText("数字格式异常");
+		           resultText.setHorizontalAlignment(JTextField.RIGHT); }  
+		/*若出现字符索引过界直接输出原结果*/
+	       catch(StringIndexOutOfBoundsException e1) { 
+		     resultText.setText(""+resultText.getText());       
+		}  
+	} 
+}