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As the name of the method goes, startsWith() method of String class determines if the value in a String object starts with a specified String or not.

Signature of startsWith() method

public boolean startsWith(String st)

• Access modifier - startsWith() method is a public method,
• Parameter passed - A String value is passed to it, which is checked for comparison against the String on which method is invoked.
• Value returned - It returns a Boolean value, which tells us whether the String on which this method was invoked, starts with the String value passed to this method or not.

startsWith() example

In the upcoming code, we have a String object initialized to a value Hello World and we are going to check whether this String object starts with a specific String value or not.

// startsWith() method of String.


class StringStartsWith
{
public static void main(String[] ar)
{
String str1= new String("Hello World");
System.out.println("String is "  + str1);

boolean boo1 = str1.startsWith("He");
System.out.println("Does "+ str1 + " starts with He ? "+ boo1);  

boolean boo2 = str1.startsWith("Hello");
System.out.println("Does "+ str1 + " starts with Hello ? "+ boo2);

boolean boo3 = str1.startsWith("World");
System.out.println("Does "+ str1 + " starts with World ? "+ boo3);  
}
}

Output is :

String is Hello World
Does Hello World starts with He ? true
Does Hello World starts with Hello ? true
Does Hello World starts with World ? false

Program Analysis

• In the first comparison, startsWith() method returns true, as the String object Hello World starts with He.
• In the second comparison, startsWith() method returns true, as String object Hello World starts with Hello.
• In the last comparison, startsWith() method returns false, as String object Hello World doesn't start with a String World, it rather ends with it.

Method startsWith() is case-sensitive.

Method startsWith() checks for comparison between String value passed to it and the invoked String object, conforming to the case sensitivity of each letter.

// startsWith() method of String.


class StringStartsWith
{
public static void main(String[] ar)
{
String str1= new String("World Peace");
System.out.println("String is "  + str1);

boolean boo1 = str1.startsWith("World");
System.out.println("Does "+ str1 + " starts with World ? "+ boo1);  

boolean boo2 = str1.startsWith("world");
System.out.println("Does "+ str1 + " starts with world ? "+ boo2);

boolean boo3 = str1.startsWith("WORLD");
System.out.println("Does "+ str1 + " starts with WORLD ? "+ boo3);  
}
}

Output is :

String is Hello World
Does World Peace starts with World ? true
Does World Peace starts with world ? false
Does Hello World starts with WORLD ? false

Program Analysis

In the code above, we have a String object initialized to a value World Peace
• In the first comparison, startsWith() method returns true, as the String object starts with World.
• In the second comparison, startsWith() method returns false, as String object does not start with world with lower case w.
• In the last comparison, startsWith() method returns false, as String object doesn't start with upper case WORLD.

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Another example of startsWith() method

// startsWith() method of String.

class StringStartsWith
{
public static void main(String[] ar)
{
String str1= new String("321... Let's go!!!");
System.out.println("String is "  + str1);

boolean boo1 = str1.startsWith("Let's");
System.out.println("Does String "+ str1 + " starts with Let's ? "+ boo1); 

boolean boo1 = str1.startsWith("21");
System.out.println("Does String "+ str1 + " starts with 21? "+ boo1); 

boolean boo2 = str1.startsWith("321");
System.out.println("Does String "+ str1 + " starts with 321 ? "+ boo2);

boolean boo3 = str1.startsWith("321..");
System.out.println("Does String "+ str1 + " starts with 321.. ? "+ boo3);  
}
}

Output is :

String is 321... Let's go!!!
Does String 321... Let's go!!! starts with Let's ? false
Does String 321... Let's go!!! starts with 21 ? false
Does String 321... Let's go!!! starts with 321 ? true
Does String 321... Let's go!!! starts with 321.. ? true

Program Analysis

In the latter code, we have a String object initialized to a value 321... Let's go!!!
• In the first comparison, startsWith() method returns false, as String object doesn't start with Let's.
• In the second comparison, startsWith() method returns false, as String object doesn't start with 21.
• In the third comparison, startsWith() method returns true, as String object starts with 321
• In the fourth comparison, startsWith() method returns true, as String object starts with 321..

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< trim() method

endsWith() method >

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