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Java 8 Stream: allMatch, anyMatch and noneMatch Example

By Arvind Rai, November 18, 2014
Java 8 Stream allMatch, anyMatch and noneMatch methods are applied on stream object that matches the given Predicate and then returns boolean value. allMatch() checks if calling stream totally matches to given Predicate, if yes it returns true otherwise false. anyMatch() checks if there is any element in the stream which matches the given Predicate. noneMatch() returns true only when no element matches the given Predicate.

Stream.allMatch

We pass Predicate as an argument to allMatch() method. That Predicate is applied to each element of stream and if each and every element satisfies the given Predicate then it returns true otherwise false.

Stream.anyMatch

For anyMatch() method we pass Predicate as an argument. The element of stream is iterated for this Predicate. If any element matches then it returns true otherwise false.

Stream.noneMatch

noneMatch() method is a method which takes argument as a Predicate and if none of element of stream matches the given Predicate, then it returns true otherwise false.

Now find the example for all the three methods allMatch(), anyMatch() and noneMatch().
MatchDemo.java
package com.concretepage.util.stream;
import java.util.List;
import java.util.function.Predicate;
public class MatchDemo {
  public static void main(String[] args) {
     Predicate<Employee> p1 = e -> e.id < 10 && e.name.startsWith("A");
     Predicate<Employee> p2 = e -> e.sal < 10000;
     List<Employee> list = Employee.getEmpList();
     //using allMatch
     boolean b1 = list.stream().allMatch(p1);
     System.out.println(b1);
     boolean b2 = list.stream().allMatch(p2);
     System.out.println(b2);
     //using anyMatch
     boolean b3 = list.stream().anyMatch(p1);
     System.out.println(b3);
     boolean b4 = list.stream().anyMatch(p2);
     System.out.println(b4);
     //using noneMatch
     boolean b5 = list.stream().noneMatch(p1);
     System.out.println(b5);
     
  }    
} 
Find the Employee class.
Employee.java
package com.concretepage.util.stream;
import java.util.ArrayList;
import java.util.List;
public class Employee {
    public int id;
    public String name;
    public int sal;
    public Employee(int id,String name,int sal  ){
        this.id = id;
        this.name = name;
        this.sal = sal;
    }
    public static List<Employee> getEmpList(){
        List<Employee> list = new ArrayList<>();
        list.add(new Employee(1, "A", 2000));
        list.add(new Employee(2, "B", 3000));
        list.add(new Employee(3, "C", 4000));
        list.add(new Employee(4, "D", 5000));
        return list;
    }
} 
Output
false
true
true
true
false
POSTED BY
ARVIND RAI
ARVIND RAI
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