Decision Making in java Questions

Given the value of a variable, write a statement, without using if construct, which will produce the absolute value of the variable.

Question:

Rewrite the following fragment using switch:

if (ch == 'E') eastern++;
if (ch == 'W') western++;
if (ch == 'N') northern++;
if (ch == 'S') southern++;
else unknown++;

What is the problem of dangling-else?
When does it arise?
What is the default dangling-else matching, and how can it be overridden?

Question:

Given the following code fragment:

if (a == 0) System.out.println("Zero");
if (a == 1) System.out.println("One");
if (a == 2) System.out.println("Two");
if (a == 3) System.out.println("Three");

Write an alternative code (using if) that saves on the number of comparisons.

Write a difference between class and a object

Comparison between if-else if and switch-case

Break statement can be used as labels in Java?

Variables used in a switch statement can be used with which datatypes?