How to check if a character is in a String in Java?

June 13, 2022

To check if a String has a character in Java, do this: string.indexOf(char) >= 0.

Here's how you do it:

String string = "Hello World!";
boolean hasH = string.indexOf('H') >= 0;
boolean hasSpace = string.indexOf(' ') >= 0;
boolean hasZ = string.indexOf('Z') >= 0;

System.out.println(hasH); // true
System.out.println(hasSpace); // true
System.out.println(hasZ); // false