Java String startsWith() usage and example

Java String (String) Methods

The Java String startsWith() method checks if the string starts with the specified string.

The syntax of the string.startsWith() method is:

string.startsWith(String str, int offset)

Here, string is an object of the String class.

startsWith() parameters

• str - Check if the string starts with str

• offset(Optional)-　 Check the substring of the string(string) starting from this index.

startsWith() return value

• If the string starts with the given stringReturns true

• If the string does not start with the given stringReturns false

Example1Java startsWith() without offset parameter

class Main {
　　public static void main(String[] args) {
　　　　String str = "Java　Programming";
　　　　System.out.println(str.startsWith("Java"));　//　true
　　　　System.out.println(str.startsWith("J"));　//　true
　　　　System.out.println(str.startsWith("Java　Program"));　//　true
　　　　System.out.println(str.startsWith("java"));　//　false
　　　　System.out.println(str.startsWith("ava"));　//　false
　　}
}

As can be seen from the above example, startsWith() is case-sensitive (lowercase and uppercase).

Example2: Java startsWith() with offset (offset) parameter

class Main {
　　public static void main(String[] args) {
　　　　String str = "Java　Programming";
　　　　//　Check substring "a　Programming"
　　　　System.out.println(str.startsWith("Java",　3));　//　false
　　　　System.out.println(str.startsWith("a　Pr",　3));　//　true
　　}
}

Here, we pass through3as the offset. Therefore, in the above program, startsWith() checks if 'a Programming' starts with the specified string.

If you need to check if a string ends with a specified string, please useJava String startsWith()Methods.

Java String (String) Methods