How to reverse each word of a given string in java?

Answer 1

String str = "Hello";
char[] reverse = new char[str.length()];
for(int i=str.length()-1, j=0; i>=0; i--, j++) reverse[j] = str.charAt(i);
System.out.println(new String(reverse));

Answer 2

Or you can just do:
String str="Hello", reverse="";
for(int i=str.length()-1; i>=0; i--) reverse+=str.charAt(i);