Java 8 Stream forEach method example.

The Stream.forEach() method works like for loop method. It iterates through each element and performs the specified operations.

package com.java2novice.streams;

import java.util.Arrays;
import java.util.List;

public class StreamForEachEx {

	public static void main(String a[]) {

		List<String> vehicles = Arrays.asList("bus", "car", "bicycle", "flight", "train");
		vehicles.stream().forEach(System.out::println);
	}
}

Output:

bus
car
bicycle
flight
train

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Interface and its usage

Interface is similar to a class which may contain method's signature only but not bodies and it is a formal set of method and constant declarations that must be defined by the class that implements it. Interfaces are useful for declaring methods that one or more classes are expected to implement, capturing similarities between unrelated classes without forcing a class relationship and determining an object's programming interface without revealing the actual body of the class.

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Java 8 Stream forEach method example.

Java 8 Streams Examples

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