java 写一个类Student,包含三个属性学号id,姓名name和年龄age;

Posted 2023-04-23

要求覆盖基类Object中的ToString()方法和Equals()方法，使得直接输出Student对象时输出的是
对象的id，name和age信息；并且当两个对象的学号相同时认为它们相等；
然后写一个主方法测试以上定义。

public class Student
public String id;
public String name;
public int age;
public Student(String id, String name, int age)
super();
this.id = id;
this.name = name;
this.age = age;

public Student(String id)
super();
this.id = id;

public String getId()
return id;

public void setId(String id)
this.id = id;

public String getName()
return name;

public void setName(String name)
this.name = name;

public int getAge()
return age;

public void setAge(int age)
this.age = age;

@Override
public String toString()
return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";


@Override
public boolean equals(Object obj)
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Student other = (Student) obj;
if (id == null)
if (other.id != null)
return false;
else if (!id.equals(other.id))
return false;

return true;




public class StuTest
public static void main(String[] args)
Student stu1=new Student("1234", "张三", 12);
Student stu2=new Student("1234");
System.out.println(stu2.equals(stu1));

参考技术A toString和equals方法可以用eclipse自动工具生成
package day01;
public class Student 
        //属性
   private int id;
   private String name;
   private int age;
   
 //get和set方法  
public int getId() 
return id;

public void setId(int id) 
this.id = id;

public String getName() 
return name;

public void setName(String name) 
this.name = name;

public int getAge() 
return age;

public void setAge(int age) 
this.age = age;




//equals方法
public boolean equals(Object obj) 
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Student other = (Student) obj;
if (age != other.age)
return false;
if (id != other.id)
return false;
if (name == null) 
if (other.name != null)
return false;
 else if (!name.equals(other.name))
return false;
return true;


//toString方法
public String toString() 
return "Student [id=" + id + ", name=" + name + ", age=" + age
+ "]";

参考技术B //类就不给你写了
public String toString()
    return "id="+this.id+"\\tname="+this.name+"\\tage="+this.age;
 
public boolean equals(Object obj)
    Student stu=(Student)obj;
    if(stu.id==this.id)
        return true;
    
    else
        return false;
    

//main方法中调用，声明stu1，stu2两个对象
System.out.println(stu1.toString());
System.out.println(stu1.equals(stu2));

参考技术C public class Student 
    private String id;

    private String name;

    private int age;

    @Override
    public int hashCode() 
        final int prime = 31;
        int result = 1;
        result = prime * result + ((id == null) ? 0 : id.hashCode());
        return result;
    

    @Override
    public boolean equals(Object obj) 
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        final Student other = (Student) obj;
        if (id == null) 
            if (other.id != null)
                return false;
         else if (!id.equals(other.id))
            return false;
        return true;
    

    @Override
    public String toString() 
        return "学号：" + id + " 姓名：" + name + " 年龄：" + age;
    

    public String getId() 
        return id;
    

    public void setId(String id) 
        this.id = id;
    

    public String getName() 
        return name;
    

    public void setName(String name) 
        this.name = name;
    

    public int getAge() 
        return age;
    

    public void setAge(int age) 
        this.age = age;
    

    public static void main(String[] args) 
        Student s1 = new Student();
        Student s2 = new Student();
        Student s3 = new Student();
        s1.setId("1");
        s1.setAge(2);
        s1.setName("小王");
        s2.setId("2");
        s2.setAge(2);
        s2.setName("小张");
        s3.setId("1");
        s3.setAge(4);
        s3.setName("小王");
        System.out.println(s1);
        System.out.println(s2);
        System.out.println(s3);
        System.out.println(s1.equals(s2));
        System.out.println(s1.equals(s3));

    

参考技术D public class Student
    int id;
    String name;
    int age;
    @Override
    public String()
    return "id:"+id+" name:"+name+" age:"+age;
    
     @Override
    public boolean equals(Student stu)
        if(this.id==stu.id)
            return true;
        
        return false;
    
    
    public static void main(String[] args) 
        Student s1=new Student();
        s1.id=1;
        s1.name="小明";
        s1.age=10;
        Student s2=new Student();
        s2.id=3;
        s2.name="小红";
        s2.age=10;
        System.out.println(s1);
        if(s1.equals(s2))
            System.out.println("相同");
        else
            System.out.println("不相同");
        
    
    

java定义一个学生类要求学号，姓名，年龄，三个成员变量

两个构造方法参数分别为：学号、姓名和；学号、姓名、年龄。要使用THIS关键字，将接收到的实参的值为每一个对应的成员变量赋值。请大家帮帮忙在线等

class Student
private int STU_NUM;
private String STU_NAME;
private int STU_AGE;
public Student(int NUM,String NAME)
this.STU_NAME=NAME;
this.STU_NUM=NUM;

public Student(int NUM,String NAME,int AGE)
this.STU_NAME=NAME;
this.STU_NUM=NUM;
this.STU_AGE=AGE;

参考技术A public class Student
public int Sno; //学号
public String Sname; //Student Name;
public int Sage; //年龄
public Student()
//无参构造器

public Student(int Sno,String Sname, int Sage)
this.Sno=Sno;
this.Sname=Sname;
this.Sage=Sage;




如果要封装, 将属性改为 private 的话 继续追问 参考技术B public class Student
private String number;
private int age;
private String name;
Student(String number,String name)
this.number = number;
this.name = name;

Student(String number,String name,int age)
this.number = number;
this.name = name;
this.age = age;

public String getNumber()
return number;

public void setNumber(String number)
this.number = number;

public int getAge()
return age;

public void setAge(int age)
this.age = age;

public String getName()
return name;

public void setName(String name)
this.name = name;