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I want to check the whitespace of a string and want to print the first character just after the whitespace to a upper case letter

You are almost there, but you need to store the new uppercase character back into your array:

    String str = "I am in trouble";
    char[] arr = str.toCharArray();
    for (int i = 0; i < arr.length; i++) {
        if (arr[i] == ' ') {
            //str.charAt(i+1);
            //Character.toUpperCase(i+1);
            char c = arr[i + 1];
            arr[i+1] = Character.toUpperCase(c); // like this;
        }
    }




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