From 70fd0a14913aee82d13568743e019c8369d87a23 Mon Sep 17 00:00:00 2001
From: tuyu <tuyu@123.com>
Date: Thu, 9 Jun 2022 21:39:26 +0800
Subject: [PATCH] =?UTF-8?q?=E8=AF=BE=E7=A8=8B=E8=AE=BE=E8=AE=A1=E5=B7=B2?=
 =?UTF-8?q?=E5=AE=8C=E6=88=90?=
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---
 src/java2022spring/Calculate.java  |  63 +++++++++++++++
 src/java2022spring/Calculator.java | 121 +++++++++++++++++++++++++++++
 src/java2022spring/Main.java       |  10 +++
 3 files changed, 194 insertions(+)
 create mode 100644 src/java2022spring/Calculate.java
 create mode 100644 src/java2022spring/Calculator.java
 create mode 100644 src/java2022spring/Main.java

diff --git a/src/java2022spring/Calculate.java b/src/java2022spring/Calculate.java
new file mode 100644
index 0000000..8101279
--- /dev/null
+++ b/src/java2022spring/Calculate.java
@@ -0,0 +1,63 @@
+package java2022spring;
+	import java.util.*;
+	public class Calculate {
+	    public String insetBlanks(String s) {
+	        String result = "";
+	        for (int i = 0; i < s.length(); i++) {
+	            if (s.charAt(i) == '(' || s.charAt(i) == ')' ||
+	                    s.charAt(i) == '+' || s.charAt(i) == '-'
+	                    || s.charAt(i) == '*' || s.charAt(i) == '/')
+	                result += " " + s.charAt(i) + " ";
+	            else
+	                result += s.charAt(i);
+	        }
+	        return result;
+	    }
+
+	    public double evaluateExpression(String expression) {
+	        Stack<Double> operandStack = new Stack<>();
+	        Stack<Character> operatorStack = new Stack<>();
+	        expression = insetBlanks(expression);
+	        String[] tokens = expression.split(" ");
+	        for (String token : tokens) {
+	            if (token.length() == 0)   
+	                continue;
+	          
+	            else if (token.charAt(0) == '+' || token.charAt(0) == '-') {
+	               
+	                while (!operatorStack.isEmpty()&&(operatorStack.peek() == '-' || operatorStack.peek() == '+' || operatorStack.peek() == '/' || operatorStack.peek() == '*')) {
+	                    processAnOperator(operandStack, operatorStack);  
+	                }
+	                operatorStack.push(token.charAt(0)); 
+	            }
+	     
+	            else if (token.charAt(0) == '*' || token.charAt(0) == '/') {
+	                while (!operatorStack.isEmpty()&&(operatorStack.peek() == '/' || operatorStack.peek() == '*')) {
+	                    processAnOperator(operandStack, operatorStack);
+	                }
+	                operatorStack.push(token.charAt(0));  
+	            }
+	            else {
+	                operandStack.push(Double.parseDouble(token));  
+	            }
+	        }
+	        while (!operatorStack.isEmpty()) {
+	            processAnOperator(operandStack, operatorStack);
+	        }
+	        return operandStack.pop();  
+	    }
+	    public void processAnOperator(Stack<Double> operandStack, Stack<Character> operatorStack) {
+	        char str = operatorStack.pop();  
+	        Double str1 = operandStack.pop();  
+	        Double str2 = operandStack.pop();
+	        if (str == '+') 
+	            operandStack.push(str1 + str2);
+	        else if (str == '-')
+	            operandStack.push(str2 - str1);   
+	        else if (str == '*')
+	            operandStack.push(str1 * str2);
+	        else if (str == '/')
+	            operandStack.push(str2 / str1);
+	    }
+	}
+
diff --git a/src/java2022spring/Calculator.java b/src/java2022spring/Calculator.java
new file mode 100644
index 0000000..dabab01
--- /dev/null
+++ b/src/java2022spring/Calculator.java
@@ -0,0 +1,121 @@
+package java2022spring;
+	import java.awt.BorderLayout;
+	import java.awt.CardLayout;
+	import java.awt.Dimension;
+	import java.awt.GridLayout;
+	import java.awt.TextField;
+	import java.awt.event.ActionEvent;
+	import java.awt.event.ActionListener;
+	import java.util.Stack;
+	import javax.swing.JButton;
+	import javax.swing.JFrame;
+	import javax.swing.JMenu;
+	import javax.swing.JMenuBar;
+	import javax.swing.JMenuItem;
+	import javax.swing.JPanel;
+	import javax.swing.JTextField;
+	public class Calculator extends JFrame{
+	 private double result=0;
+	 private int count=0;
+	 public Calculator() {
+	  this.setSize(330,399);  
+	  this.setTitle("计算器");  
+	  init();
+	  this.setVisible(true);
+	  this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
+	 }
+	 public void init() {
+	  this.setLayout(new BorderLayout()); 
+	  JTextField textField=new JTextField();
+	  textField.disable();
+	  textField.setPreferredSize(new Dimension(this.getWidth(),50));
+	  this.add(textField,BorderLayout.NORTH);
+	  JPanel panel=new JPanel();
+	  panel.setLayout(new BorderLayout());
+	  this.add(panel, BorderLayout.CENTER);
+	  
+	  JPanel panelN=new JPanel();
+	  panelN.setLayout(new GridLayout(1,6));
+	  JButton MC=new JButton("MC");
+	  JButton MR=new JButton("MR");
+	  JButton M0=new JButton("M+");
+	  JButton M1=new JButton("M-");
+	  JButton MS=new JButton("MS");
+	  JButton M=new JButton("M");
+	  panelN.add(MC);panelN.add(MR);panelN.add(M0);
+	  panelN.add(M1);panelN.add(MS);panelN.add(M);
+	  panel.add(panelN,BorderLayout.NORTH);
+	  
+	  CardLayout cardLayout=new CardLayout();
+	  JPanel panelC=new JPanel();
+	  panelC.setLayout(cardLayout);
+	  
+	  JPanel panel0=new JPanel();
+	  panel0.setLayout(new GridLayout(6,4));
+	  JButton[] standredButton=new JButton[24];
+	  String str[]={"%","√","x²","1/x",
+	    "CE","C","×","/",
+	    "7","8","9","*",
+	    "4","5","6","-",
+	    "1","2","3","+",
+	    "±","0",".","=" 
+	  };
+	  for(int i=0;i<standredButton.length;i++) {
+	   standredButton[i]=new JButton(str[i]);
+	   String text=standredButton[i].getText();
+	   standredButton[i].addActionListener(new ActionListener() {
+	    
+	    public void actionPerformed(ActionEvent e) {
+	     if(text.equals("CE")||text.equals("C")) {
+	      textField.setText("");
+	     }
+	     else if(text.equals("=")) {
+	      String expression=textField.getText();
+	      Calculate cal=new Calculate();
+	      textField.setText(cal.evaluateExpression(expression)+"");
+	     }
+	     else if(text.equals("%")) {
+	      
+	     }
+	     else if(text.equals("√")) {
+	      result=Double.parseDouble(textField.getText());
+	      result=Math.sqrt(result);
+	      textField.setText(result+"");
+	     }
+	     else if(text.equals("x²")) {
+	      result=Double.parseDouble(textField.getText());
+	      result*=result;
+	      textField.setText(result+"");
+	     }
+	     else if(text.equals("1/x")) {
+	      result=Double.parseDouble(textField.getText());
+	      result=1/result;
+	      textField.setText(result+"");
+	     }
+	     else if(text.equals("±")) {
+	      if(count==0) {
+	       textField.setText(textField.getText()+"-");
+	       count=1;
+	      }
+	      else {
+	       textField.setText(textField.getText()+"+");
+	       count=0;
+	      }
+	     }
+	     else if(text.equals("×")) {
+	      textField.setText(textField.getText().substring(0, textField.getText().length()-1));
+	     }
+	     else {
+	      textField.setText(textField.getText()+text);
+	     }       
+	    }   
+	   }   
+	   );
+	   panel0.add(standredButton[i]);
+	  }
+	  panelC.add(panel0);
+	  panel.add(panelC,BorderLayout.CENTER);
+	  JMenuBar menuBar=new JMenuBar();
+	 }
+	}
+	 
\ No newline at end of file
diff --git a/src/java2022spring/Main.java b/src/java2022spring/Main.java
new file mode 100644
index 0000000..968ed41
--- /dev/null
+++ b/src/java2022spring/Main.java
@@ -0,0 +1,10 @@
+package java2022spring;
+
+public class Main {
+
+	public static void main(String[] args) {
+		// TODO ×Ô¶¯Éú³ÉµÄ·½·¨´æ¸ù
+		Calculator calculator=new Calculator();
+	}
+
+}
-- 
Gitee