Java 8 Stream anyMatch(), allMatch() and noneMatch() example.
Stream.anyMatch() returns whether any elements of this stream match the provided predicate. May not evaluate the predicate on all elements if not necessary for determining the result. If the stream is empty then false is returned and the predicate is not evaluated.
Stream.allMatch() returns whether all elements of this stream match the provided predicate. May not evaluate the predicate on all elements if not necessary for determining the result.
Stream.noneMatch() returns whether no elements of this stream match the provided predicate.
package com.java2novice.streams;
import java.util.ArrayList;
import java.util.List;
import com.java2novice.lambda.Employee;
public class StreamMatchEx {
public static void main(String a[]) {
List<Employee> empList = new ArrayList<>();
empList.add(new Employee("Nataraja G", "Accounts", 8000));
empList.add(new Employee("Nagesh Y", "Admin", 15000));
empList.add(new Employee("Vasu V", "Security", 2500));
empList.add(new Employee("Amar", "Admin", 12500));
boolean result = empList.stream().anyMatch(emp->emp.getAccount().matches("Admin"));
System.out.println(result);
result = empList.stream().allMatch(emp->emp.getAccount().matches("Admin"));
System.out.println(result);
result = empList.stream().noneMatch(emp->emp.getAccount().matches("Admin"));
System.out.println(result);
}
}
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package com.java2novice.lambda;
public class Employee {
private String name;
private String account;
private Integer salary;
public Employee(String name, String account, Integer salary) {
super();
this.name = name;
this.account = account;
this.salary = salary;
}
@Override
public String toString() {
return "name: "+ this.name +" | account: "+ this.account +" | salary: "+this.salary;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAccount() {
return account;
}
public void setAccount(String account) {
this.account = account;
}
public Integer getSalary() {
return salary;
}
public void setSalary(Integer salary) {
this.salary = salary;
}
}
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