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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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Array Output 1

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public class JavaRecipe{      public static void main(String[] jr){           int[] arr = new int[0]; // Line 1           System.out.println(arr.length); // Line 2      } } 1. Compilation error at Line 1 : size of array cant be 0 2. Compiles fine and gives output as 0 3. Runntime error at line 2 : NullPointerException
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