public int indexOf(int ch);
public int indexOf(int ch, int fromIndex);
 
public int indexOf(String str);
public int indexOf(String str, int fromIndex);

public int lastIndexOf(int ch);
public int lastIndexOf(int ch, int fromIndex);
 
public int lastIndexOf(String str);
public int lastIndexOf(String str, int fromIndex);

package in.bench.resources.java8.string.methods;

import java.util.stream.Stream;

public class FirstAndLastIndexOfString {

	public static void main(String[] args) {

		// test string
		String str = "BenchResources";


		// 1. find 1st index of character 'R'
		int indexR = Stream
				.of(str)
				.map(s -> s.indexOf('R'))
				.findAny()
				.get();
		System.out.println("First index of 'R' is = " + indexR);


		// 2. find 1st index of sub-string "source"
		int indexSource = Stream
				.of(str)
				.map(s -> s.indexOf("source"))
				.findAny()
				.get();
		System.out.println("First index of \"source\" is = " + indexSource);


		// 3. find last index of character 'e'
		int indexE = Stream
				.of(str)
				.map(s -> s.lastIndexOf('e'))
				.findAny()
				.get();
		System.out.println("Last index of 'e' is = " + indexE);


		// 4. find last index of sub-string "Ben"
		int indexBen = Stream
				.of(str)
				.map(s -> s.lastIndexOf("Ben"))
				.findAny()
				.get();
		System.out.println("Last index of \"Ben\" is = " + indexBen);
	}
}

First index of 'R' is = 5
First index of "source" is = 7
Last index of 'e' is = 12
Last index of "Ben" is = 0