package Bianliang; //首先要定义一个类 写一个类方法 public class Jisuanqi { double jia1; double jia2; double jiafa(double a, double b) { return a + b; } double jianfa(double a, double b) { return a - b; } double chengfa(double a, double b) { return a * b; } // double chufa(double a, double b) { // if (b==0) { // System.out.println("除数不能为零"); // return 0; // } else { // return a / b; // } // } int jiafa(int a, int b){ return a+b; } int jianfa(int a, int b){ return a-b; } int chengfa(int a,int b){ return a*b; } void chufa1(int a,int b){ if(b == 0){ System.out.println("啊啊啊啊"); return; }else{ System.out.println("除法的结果:"+a/b); } } }
package Bianliang; //然后实例化这个类 并引用进行使用 public class Main { public static void main(String[] args) { Jisuanqi jiafa = new Jisuanqi(); double a1= jiafa.jiafa(10, 11); double a2= jiafa.jianfa(5, 8); double a3= jiafa.chengfa(10, 9); jiafa.chufa1(3, 0); System.out.println(a1); System.out.println(a2); System.out.println(a3); System.out.println(); } }