Stop executing further code in Java

Question

I have looked in the Javadoc but couldn't find information related to this.

I want the application to stop executing a method if code in that method tells it to do so.

If that sentence was confusing, here's what I want to do in my code:

public void onClick(){

    if(condition == true){
        stopMethod(); //madeup code
    }
    string.setText("This string should not change if condition = true");
}

So if the boolean condition is true, the method onClick has to stop executing further code.

This is just an example. There are other ways for me to do what I am trying to accomplish in my application, but if this is possible, it would definitely help.

Answer 1

Just do:

public void onClick() {
    if(condition == true) {
        return;
    }
    string.setText("This string should not change if condition = true");
}

It's redundant to write if(condition == true), just write if(condition) (This way, for example, you'll not write = by mistake).

Answer 2

return to come out of the method execution, break to come out of a loop execution and continue to skip the rest of the current loop. In your case, just return, but if you are in a for loop, for example, do break to stop the loop or continue to skip to next step in the loop

Answer 3

To stop executing java code just use this command:

    System.exit(1);

After this command java stops immediately!

for example:

    int i = 5;
    if (i == 5) {
       System.out.println("All is fine...java programm executes without problem");
    } else {
       System.out.println("ERROR occured :::: java programm has stopped!!!");
       System.exit(1);
    }

Answer 4

There are two way to stop current method/process :

1. Throwing Exception.
2. returnning the value even if it is void method.

Option : you can also kill the current thread to stop it.

For example :

public void onClick(){

    if(condition == true){
        return;
        <or>
        throw new YourException();
    }
    string.setText("This string should not change if condition = true");
}

Answer 5

You can just use return to end the method's execution

Answer 6

Either return; from the method early, or throw an exception.

There is no other way to prevent further code from being executed short of exiting the process completely.

Answer 7

In your thread, you need to check Thread.interrupted(), and if you have a flag too as some others mentioned, that'd be handy too. All based on your specific use case.

Answer 8

I think just using return; would do the job