Java for 循环被跳过 - 我的错误？

Question

I have already some c# knowledge but I'm really confused by such an easy thing, but maybe the problem is deeper than I expect. I imported a "little game" for learning java and wrote that code:

import de.ur.mi.bouncer.apps.BouncerApp;

public class DasErsteHindernis extends BouncerApp {

@Override
public void bounce() {
    loadMap("Obstacles");
    runtillwall();
    climbupwards();

}

private void runtillwall(){
    while(bouncer.canMoveForward() == true){
        bouncer.move();
    }
}
private void climbupwards(){
    bouncer.turnLeft();
    bouncer.move();
    for(int i = 0; i==2; i++){
        bouncer.turnLeft();
    }




}

But the for loop gets skipped -> the bouncer doesn't turn left. What did I do wrong?

Answer 1

The middle part of a for loop is a condition. Yours is saying while i is equal to 2, do this. It never gets to two, so it never executes. You should be using the less-than or less-than-or-equal-to sign. (< <=)

Answer 2

for(int i = 0; i==2; i++){

Here you are initializing i with 0,so first when loop starts i is 0 ,then middle part which is condition in your loop that should be true for loop to start.In your case,you are saying if i is equal to 2 then execute the instruction.It fails and your loop body is not executed single time.

it seems you need

 for(int i = 0; i<=2; i++){

This one will execute loop body 3 times.

See Also

• for loop in Java