JAVA

get first 5 characters of string java

firstFourChars = input.substring(0, 4);

get first character of string java

var string = "freeCodecamp";

string.charAt(0); // Returns "f"

check first character of string is number java

String myString = "1253";
if(Character.isDigit(myString.charAt(0))){
 	System.out.println("First character of string is a number");
}
else{
	System.out.println("First character of string is not a number");
}