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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 	HashSet<Person> set=new HashSet<Person>();
  13. 	set.add(new Person(110,"1"));
  14. 	set.add(new Person(110,"1"));
  15. 	}
  16. }
  17. class Person{
  18. 	int id;
  19. 	String name;
  20. 	public Person(int id,String name){
  21. 		super();
  22. 		this.id=id;
  23. 		this.name=name;
  24. 	}
  25.  
  26. 	public int hashCode(){
  27. 		return this.id;
  28. 	}
  29.  
  30. 	public boolean equals(Object obj){
  31. 		Person p = (Person)obj;
  32. 		return this.id=p.id;
  33. 	}
  34.  
  35. 	public String toString(){
  36. 		return "编号:"+this.id+"name:"+this.name;
  37. 	}
  38.  
  39. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:32: error: incompatible types: int cannot be converted to boolean
		return this.id=p.id;
		              ^
1 error
stdout
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Standard output is empty
https://ideone.com/5Cq2id
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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