Question

How to iterate over a queue in Java

Answer 1

import java.util.LinkedList; 
import java.util.Queue; 
 
public class MyClass {
    public static void main(String args[]) { 
        Queue<Integer> queue = new LinkedList<Integer>();
         
        queue.add(4); 
        queue.add(6); 
        queue.add(3); 
        queue.add(7); 
        queue.add(2); 

        for (Integer item: queue) {
            System.out.println(item);
        }
    }
}
 
 
 
 
/*
run:
 
4
6
3
7
2

*/

 

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Answer 2

import java.util.LinkedList; 
import java.util.Iterator;
import java.util.Queue; 

public class MyClass {
    public static void main(String args[]) { 
        Queue<Integer> queue = new LinkedList<Integer>();
         
        queue.add(4); 
        queue.add(6); 
        queue.add(3); 
        queue.add(7); 
        queue.add(2); 

        Iterator<Integer> it = queue.iterator();
 
        while (it.hasNext()) {
            System.out.println(it.next());
        }
    }
}
 
 
 
 
/*
run:
 
4
6
3
7
2

*/

 

70+ SQL courses for beginners and professionals

Answer 3

import java.util.LinkedList; 
import java.util.Queue; 

public class MyClass {
    public static void main(String args[]) { 
        Queue<Integer> queue = new LinkedList<Integer>();
         
        queue.add(4); 
        queue.add(6); 
        queue.add(3); 
        queue.add(7); 
        queue.add(2); 

        queue.stream().forEach(n -> {
            System.out.println(n);
        });
    }
}
 
 
 
 
/*
run:
 
4
6
3
7
2

*/

 

70+ SQL courses for beginners and professionals

Answer 4

import java.util.LinkedList; 
import java.util.Queue; 

public class MyClass {
    public static void main(String args[]) { 
        Queue<Integer> queue = new LinkedList<Integer>();
         
        queue.add(4); 
        queue.add(6); 
        queue.add(3); 
        queue.add(7); 
        queue.add(2); 

        queue.stream().forEach(System.out::println);
    }
}
 
 
 
 
/*
run:
 
4
6
3
7
2

*/

 

70+ SQL courses for beginners and professionals