Question

How to use stream to check if all ArrayList values are match to an expression in Java

Answer 1

package javaapplication1;

import java.util.ArrayList;
import java.util.stream.Stream;

public class JavaApplication1 {

    public static void main(String[] args) {

        try {

            ArrayList<Integer> list = new ArrayList<Integer>();
            list.add(30);
            list.add(40);
            list.add(60);
            list.add(70);
            list.add(90);

            Stream<Integer> stream = list.stream();
            
            // all values are >= 30
            boolean b = stream.allMatch(n -> {
                return n >= 30;
            });
            System.out.println(b);

        } catch (Exception e) {
            System.out.println(e.toString());
        }
    }
}

/*
                   
run:
      
true
          
 */

 

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Answer 2

package javaapplication1;

import java.util.ArrayList;
import java.util.stream.Stream;

public class JavaApplication1 {

    public static void main(String[] args) {

        try {

            ArrayList<Integer> list = new ArrayList<Integer>();
            list.add(30);
            list.add(40);
            list.add(60);
            list.add(70);
            list.add(90);

            Stream<Integer> stream = list.stream();
            
            // not all values are >= 40
            boolean b = stream.allMatch(n -> {
                return n >= 40;
            });
            System.out.println(b);

        } catch (Exception e) {
            System.out.println(e.toString());
        }
    }
}

/*
                   
run:
      
false
          
 */

 

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