//Student.java
class Student{
private int roll;
private String name;
public Student(int roll,String name){
this.roll=roll;
this.name=name;
}
public int hashCode(){
return roll+name.length();
}
public boolean equals(Object obj){
Student s=(Student)obj;
return (this.roll==s.roll && this.name.equals(s.name));
}
}
//IssueID.java
class IssueID{
public static void issueID(Student s1,Student s2){
if(s1.equals(s2))
System.out.println("New ID issued");
else
System.out.println("New ID NOT issued");
}
}
//Institute.java
import java.lang.Object;
class Institute{
public static void main(String[] args){
Student s1=new Student(38,"shiva");
Student s2=new Student(45,"aditya");
IssueID.issueID(s1,s2);
System.out.println(s1.hashCode());
System.out.println(s2.hashCode());
}
}
如上述代码,我已覆盖了hashCode()
方法。这可能听起来很傻,但我能同时使用相同的学生对象(s1和s2)访问java.lang.Object.hashCode()
方法吗?
super.hashCode()
,但在我看来这没有什么用处。 - Rohit Jain