一.代码源

package aaa;import java.text.DecimalFormat;import java.util.Scanner;public class Dada {		public static void main(String[] args) {		int condition=1 ;		Dada dada = new Dada();		Scanner scanner = new Scanner(System.in);		while(condition==1){		System.out.print("请输入第一个数：");		double x = scanner.nextDouble();		System.out.print("请输入第二个数：");		double y = scanner.nextDouble();		System.out.print("请输入运算符：");		String s = scanner.next();		char z = s.charAt(0);		Test test=new Test();		test.yunsuan(x, y, z);		System.out.print("是否继续？1是  其他为否");		condition = scanner.nextInt();}		}	}	package aaa;import java.text.DecimalFormat;public class Test{public static int yunsuan(double x,double y,Character z){		DecimalFormat r=new DecimalFormat(); 		if(z.equals('+')){			System.out.println(x+"+"+y+"=" + r.format((x+y)));		} 		return 1;		}public static int yunsuan1(double x,double y,Character z){	DecimalFormat r=new DecimalFormat();	if(z.equals('-')){		System.out.println(x+"-"+y+"=" + r.format((x-y)));}	return 1;}public static int yunsuan2(double x,double y,Character z){	DecimalFormat r=new DecimalFormat();	 if(z.equals('*')){			System.out.println(x+"*"+y+"=" + r.format((x*y)));		}return 1;}public static int yunsuan3(double x,double y,Character z){	DecimalFormat r=new DecimalFormat();	if(z.equals('/')){		if(y==0){			System.out.println("被除数不能为0");		} else{			System.out.println(x+"/"+y+"=" + r.format((x/y)));		}						}	return 1;	}}

　二.测试结果

三.感想

     基础太差了，实力跟不上想法，虽然现在在努力的解决实力问题，可却不是短时间内可以改变的，所以老师的要求基本都没有怎么实现，但之后我一定会补交一份完整的作业！