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String and NULL!!!

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What is the expected output?       public static void main(String args []) {                     String stmt = null;                     System.out.print(null+stmt);                     System.out.print(stmt+null);         } Please choose only one answer:  RuntimeException is thrown because of the first print statement  RuntimeException is thrown because of the second print statement  nullnullnullnull  nullnull  compilation error Post your doubt in the comment section below.
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Java Constructor !?

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What is the expected output? public class Profile {           private Profile(int w) { // line 1           System.out.println(w); }            public static Profile() { // line 5            System.out.println(10); }            public static void main(String args[]) {            Profile obj = new Profile(50); } } Please choose only one answer: Won't compile because of line (1) – constructor can't be private 10            50 50 Won't compile because of line (5) – constructor can't be static
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String and StringBuffer!

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Select the common methods, which are defined for both type String and type StringBuffer ?         Please choose all the answers that apply:   toString()   length()  append(String)  trim()  equals(Object)   Put your doubts in the comment section. 
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