Equals() method of object class

package itheima_02;

/*
Test class
*/

public class ObjectionDemo {
    
public static void main(String[] args) {
    
Student s1 = new Student();
s1.setName(" Brigitte Lin ");
s1.setAge(30);

 Student s2 = new Student();
    s2.setName(" Brigitte Lin ");
    s2.setAge(30);

    // demand , Compare the contents of two objects 
  // System.out.println(s1 == s2);

    System.out.println(s1.equals(s2));
    /* public boolean equals(Object obj) { // this --- s1 //obj --- s2 return (this == obj); }*/
}
}

package itheima_02;

public class Student {
    
private String name;
private int age;

public Student() {
    

}

public Student(String name, int age) {
    
    this.name = name;
    this.age = age;
}

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 boolean equals(Object o) {
    
    /* this --- s1 o ---s2 */
    // Compare the addresses , If the same , Go straight back to true
    if (this == o) return true;

    // Judge whether the parameter is null
    //  Determine whether two objects come from the same class 
    if (o == null || getClass() != o.getClass()) return false;

    // Move down 
    Student student = (Student) o;// student = s2;

    // Compare the same age 
    if (age != student.age) return false;

    // Compare whether the contents of the names are the same 
    return name != null ? name.equals(student.name) : student.name == null;
}
}

public String to String() Returns the string representation of the object . It is recommended that all subclasses override this method , Automatic generation .

public boolean equals(Object obj) Compare objects for equality , Default comparison address , Rewriting can compare content , Automatic generation .