please explain the code

[anamika henry]

Hii everyone...Can anyone please explain me the following code line by line..as what is happening in everyline i'll really appreicate...thanks

1.class Q6{
2.public static void main(String args[]){
3.Holder h= new Holder();
4.h.held=100;
5.h.bump(h);
6.System.out.println(h.held);
7.}
8.}
9.class Holder{
10.public int held;
11.public void bump(Holder theHolder){
12.theHolder.held++;}
13.}

output is - 101

[marc weber]

class Q6 {
  public static void main(String args[]) {
    Holder h = new Holder(); //creates new instance of Holder
    h.held = 100; //sets the instance's "held" variable to 100
    h.bump(h); //calls bump method, which increases "held" by 1
    System.out.println(h.held); //prints value of "held"
  }
}
 
class Holder {
  public int held;
  public void bump(Holder theHolder) {
    theHolder.held++;
  }
}

Do these comments help? What exactly are you questioning here?

[anamika henry]

Hii marc thanks for the explaination can you please explain me the line of class Holder.. Particularly line 11 and 12 .

9.class Holder{
10.public int held;
11.public void bump(Holder theHolder){
12.theHolder.held++;}
13.}

[marc weber]

public void bump(Holder theHolder) {
  theHolder.held++;
}

This is a definition for a method called bump. The method has public access and its return type is void (meaning that it doesn't return anything).

The method takes an instance of Holder as an argument. Inside the method, that instance of Holder is referenced by a local variable called theHolder.

In the method body (inside the {} braces), the held variable of "theHolder" is incremented by 1. This is done using the post-increment operator ++.

There is no value returned by this method, but because it's using a reference to an instance of Holder, that instance of holder will be modified.

[Patrick Patel]

9.class Holder{
10.public int held;
//Method Receives an instance of Holder. The Holder instance is passed by references
11.public void bump(Holder theHolder)
{
//Increments the held property of the Holder instance
12. theHolder.held++;}
13. }

[marc weber]

Originally posted by Patrick Patel:
... The Holder instance is passed by references...

Careful... Java is pass by value, so a copy of the reference is passed.