Write down the syntax to replace the word "old" with the word "new" in a given String st = "old is always old"

Write down the syntax to check if the second character of a String(str) is in upper case.

Predict the output of the following Java program snippet:

String n1 = "46", n2 = "64";
int total = Integer.parseInt(n1) + Integer.parseInt(n2);
System.out.println("The sum of " + "46 " + "and" + " 64" + " is " + total);

Predict the output of the following Java program snippet:

boolean p;
p = ("BLUEJ".length() > "bluej".length()) ? true: false;