将值分配给Java中的对象字段？

Question

For example, if I have this:

class Test{
  private int id;

  public Test(int id){
    id=id;
  }
}

In this case, how can I assign the value of the id parameter to the id field?

Answer 1

Use

 this.id = id;

because this refers to the current object.

Learn more here: http://docs.oracle.com/javase/tutorial/java/javaOO/thiskey.html

Answer 2

Use this :

public Test(int id){
    this.id = id;
}

From here :

Within an instance method or a constructor, this is a reference to the current object — the object whose method or constructor is being called. You can refer to any member of the current object from within an instance method or a constructor by using this .

Answer 3

您可以使用assign：

this.id = id;

Answer 4

data instance hiding is happening here.your local variable is hiding your instance variable. so to access the instance data , always use " this"

so this.name=name