Java 面对对象事例

1.

public class Hethod
    public String oddnumber(int num){
        if(num%2==0){retrun "偶数";}
        else{retrun "奇数";}
    }
    public static void main (String[] args){
        int a=10;
        Hethod method=new Hethod();
        String r1=method.oddnumber(a);
        System.out.pringln(a+"是"+r1);
        int b=9;
        String r2=method.oddnumber(b);
        System.out.println(b+"是"+r2);
    }
}

2.

public calss Student{//学生属性
    String name;//null
    int age;//0
    public void study{
        System.out.println(this.name+"在学习");//方法
    }
    public static void main(String[] args){
        //类：抽象的，实例化
        //类实例化后会返回一个自己的的对象
        //student对象就是一个student类的具体事例
        Student xiaoming=new Student();
        Student xh=new Student();
        xiaoming.name="小明";
        xiaoming.age=18;
        System.out.println(xiaoming.name);
        System.out.println(xiaoming.age);
        xh.name="小红";
        xh.age=18;
        System.out.println(xh.name);
        System.out.println(xh.age);
    }
}