public class Test {
public static void main(String[] args) {
System.out.println(Math.min(Double.MIN_VALUE, 0.0d));
    }
}

public class Test {
public static void main(String[] args) throws Exception {
char[] chars = new char[] {'\u0097'};
String str = new String(chars);
byte[] bytes = str.getBytes();
System.out.println(Arrays.toString(bytes));
    }
}

public int compareTo(Object o){
Employee emp = (Employee) emp;
return this.id - o.id;
}

int x = 0;
boolean bExit = false;

Thread 1 (not synchronized)
x = 1; 
bExit = true;

Thread 2 (not synchronized)
if (bExit == true) 
System.out.println("x=" + x);

1. When Singleton doesn't remain Singleton in Java?
2. is it possible to load a class by two ClassLoader?
3. is it possible for equals() to return false, even if contents of two Objects are same?
4. Why compareTo() should be consistent to equals() method in Java?
5. When do Double and BigDecimal give different answers for equals() and compareTo() == 0. 
6. How does "has before" apply to volatile work?
7. Why is 0.1 * 3 != 0.3,
8. Why is (Integer) 1 == (Integer) 1 but (Integer) 222 != (Integer) 222 and which command arguments change this.
9. What happens when exception is thrown by a Thread?
10. Difference between notify() and notifyAll() call?
11. Difference between System.exit() and System.halt() method?
12. Does following code legal in Java? is it example of method overloading or overriding?

public String getDescription(Object obj){
return obj.toString;
}
public String getDescription(String obj){
return obj;
}
and
public void getDescription(String obj){
return obj;
}