请问该如何使用java写一个类，如下：

Question

写一个类Student，包含两个属性String name和int age；要求覆盖toString()方法和
equals()方法，使得直接输出Student对象时输出的是对象的name和age；并且当两个
对象的name和age都相同时认为它们相等；然后写一个主方法测试以上定义。
2,写一个程序，要求运行时从命令行输入不同的值打印不同的结果，若输入：male
则输出“you are a boy!”；若输入：female，则输出“you are a girl!”；若输入其他值
则输出“you are wrong!!”。

Answer 1

(1)public class M{public static void main(String args[]){Students stu1=new Students("Ni",25);Students stu2=new Students("Wo",30);stu1.toString();stu2.toString();if(stu1.equals(stu2))System.out.print("they are equal");}}class Students{public String name;public int age;Students(String name,int age){this.name=name;this.age=age;}public String toString(){String str="name is :"+name+'\n'+"age is :"+age;System.out.println(str);return str;}public boolean equals(Students stu){if((this.name==stu.name)&&(this.age==stu.age))return true;elsereturn false;}}(2)import java.util.*;import java.io.*;public class N{public static void main(String args[]) throws IOException{Scanner sc=new Scanner(System.in);System.out.println("请输入一个字符串：");String str=sc.next();//String str1=new String()if(str.equals("male"))System.out.println("you are a boy!");else if(str.equals("female"))System.out.println("you are a girl!");elseSystem.out.println("you are wrong!!");}}

Answer 2

1.class Student{String name;int age;public Student(String name,int age){this.name=name;this.age=age;}public String toString(){return "你的姓名是："+name+"，你的年龄是："+age;}public boolean equals(Object another){return name.equals(another.name)&&age==another.age;}}//测试程序public class TestStudent{public static void main(String[] args){Student student1,student2,student3;student1=new Student("迈克尔·杰克逊",50);student2=new Student("迈克尔·乔丹",50);student3=new Student("迈克尔·乔丹",50);System.out.println(student1+(student1.equals(student2)?"等于":"不等于")+student2);System.out.println(student2+(student2.equals(student3)?"等于":"不等于")+student3);}}2.public class WhatIsYourSex{public static void main(String[] args){if(args.length==1){if(args[0].equals("male")){System.out.println("you are a boy!");}else if(args[0].equals("female")){System.out.println("you are a girl!");}else{System.out.println("you are wrong!!");}}else{System.out.println("you are wrong!!");}}} 

Answer 3

public class Student{private String name;private int age;Student(String name,int age){this.age = age;this.name = name;}public String toString(){return this.name+this.age;}public Boolean equals(Object obj)｛Boolean isequals;if(obj.name==this.name&&obj.age==this.age){isequals = true;}else isequals = false;return isequals;}}public class testStu{public static void main(String[] args){Student a1 = new Student("a1",18);Student a2 = new Student("a1",18);System.out.println("a1"+a1.toString());System.out.println("a2"+a2.toString());if(a1.equals(a2)){System.out.println("a1 equals a2");} else System.out.println("a1 不等于 a2");}}2：public class test{public static void main(String[] agcs){try{String flag = agcs[0];switch(flag){case "male":System.out.println("you are a boy!");break;case "female":System.out.println("you are a girl!");break;default:System.out.println("you are wrong!!");break;}}catch(ArrayIndexOutOfBoundsException e){System.out.println("没有输入参数");}}}