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indexOf(String str) and lastIndexOf(String str) String functions in java


indexOf(String str): Returns the index of the first occurrence of the specified substring within this string.

Syntax:  public int indexOf(String str).

Note: If no such occurrence of substring within this string than it returns -1.

lastIndexOf(String str): Returns the index of the last occurrence of the specified substring within this string.

Syntax: public int lastIndexOf(String str).

Note: If no such occurrence of substring within this string than it returns -1.

Example:

StringIndexTestExample.java

/**
 * This program is used to show the use 
 * of indexOf and lastIndexOf() method.
 * @author codesjava
 */
class TestString{
	String str = "www.codesjava.com";
 
	/**
	 * This method is used to show the use of indexOf() method.
	 * @author codesjava
	 */
	public void indexOfTest(){
		System.out.println(str.indexOf("o"));
	}
 
	/**
	 * This method is used to show the use of lastIndexOf() method.
	 * @author codesjava
	 */
	public void lastIndexOfTest(){
		System.out.println(str.lastIndexOf("a"));
	}
}
 
public class StringIndexTestExample {
	public static void main(String args[]){
		//creating TestString object
		TestString obj = new TestString();
 
		//method call
		obj.indexOfTest();
		obj.lastIndexOfTest();
	}
}

Output:

5
12

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Previous Topic: startsWith(String prefix) and endsWith(String suffix) String functions in java.

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