import java.lang.invoke.SwitchPoint; import java.util.Scanner;public class TestDemo {public static void main(String[] args) {while (true) {System.out.println("輸入計算類型（+，-，*，/）,輸入quit退出");Scanner calculate = new Scanner(System.in);String cal = calculate.nextLine();if(cal.equals("quit")){System.out.println("已退出計算器");break;}else {switch (cal) {case "+":System.out.println("輸入要進行計算的兩個數(注意順序,回車分割)：");Scanner addScanner1 = new Scanner(System.in);double addNum1 = addScanner1.nextInt();Scanner addScanner2 = new Scanner(System.in);double addNum2 = addScanner2.nextInt();double addResult = add(addNum1, addNum2);System.out.println(addNum1 + "+" + addNum2 + "=" + addResult);break;case "-":System.out.println("輸入要進行計算的兩個數(注意順序,回車分割)：");Scanner minusScanner1 = new Scanner(System.in);double minusNum1 = minusScanner1.nextInt();Scanner minusScanner2 = new Scanner(System.in);double minusNum2 = minusScanner2.nextInt();double minusResult = minus(minusNum1, minusNum2);System.out.println(minusNum1 + "-" + minusNum2 + "=" + minusResult);break;case "*":System.out.println("輸入要進行計算的兩個數(注意順序,回車分割)：");Scanner mutiplyScanner1 = new Scanner(System.in);double mutiplyNum1 = mutiplyScanner1.nextInt();Scanner mutiplyScanner2 = new Scanner(System.in);double mutiplyNum2 = mutiplyScanner2.nextInt();double mutiplyResult = multiply(mutiplyNum1, mutiplyNum2);System.out.println(mutiplyNum1 + "*" + mutiplyNum2 + "=" + mutiplyResult);break;case "/":System.out.println("輸入要進行計算的兩個數(注意順序,回車分割)：");Scanner divideScanner1 = new Scanner(System.in);double divideNum1 = divideScanner1.nextInt();Scanner divideScanner2 = new Scanner(System.in);double divideNum2 = divideScanner2.nextInt();double divideResult = divide(divideNum1, divideNum2);System.out.println(divideNum1 + "/" + divideNum2 + "=" + divideResult);break;}}}}public static double add(double a,double b ){return a+b;}public static double minus(double a,double b ){return a-b;}public static double multiply(double a,double b ){return a*b;}public static double divide(double a,double b ){return a/b;} }

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