遍历数组的Java代码

Question

why is my code here not working im trying to print out every second number in the sequence as hello

public class Generalizations {
    public static void main(String[] args) {


        for(int i=0;i<10;i++)
            System.out.println(i);
        if (i%2==0){
            System.out.println("hello");
        }
    }
}

Answer 1

To print every second element, print inside the condition as shown below:

for(int i=0;i<10;i++) {//esnure the brace here       
   if (i%2 == 0) {
       System.out.println(i);//prints every second element
   }
}

Answer 2

You missed the curly braces of for loop.

public class Generalizations {
    public static void main(String[] args) {


        for(int i=0;i<10;i++){
            System.out.println(i);
            if (i%2==0){
                System.out.println("hello");
            }
        }
        }
    }

Answer 3

use this

public class Generalizations {
public static void main(String[] args) {


    for(int i=0;i<10;i++){
        System.out.println(i);
        if (i%2==0){
            System.out.println("hello");
        }
    }
}

Answer 4

If you want to print every second number as hello, you can try below looping :

for(int i=1;i<=10;i++){            
        if (i%2==0){
            System.out.println("hello");
        }else{
            System.out.println(i);
        }
    }

Answer 5

It's because the 'for' loop is missing the curly braces thus only one line below it is printed. If you want more than one statements to be executed in the 'for' loop, add a curly brace before the statements start and after your block of statements end. I believe your code does currently print one Hello though, doesn't it? That is because when the if statement runs the value of i is 10 thus fulfilling the if condition.

Answer 6

Your missing a curly brace at the start of your for loop.

for(int i=0;i<10;i++)

should be

for(int i=0;i<10;i++){