Logical Interview Question and Answer

Q. 1- Is the code compiles ? If yes then what will be the output ?
public class supper { int i; public int getI() { return i; } public void setI(int i) { this.i = i; } public static void main(String[] args) { supper obj=new supper(); obj.setI(3); System.out.println(obj.getI()); supper b=obj; b.setI(4); System.out.println(b.getI()); } }
Output is:    3 4
Q. 2-Is the code compiles ? If yes then what will be the output ?
public class Consoletest{ public static void main(String[] args) { Console c=System.console(); System.out.println(c); } }
Output is:       null
Q. 3-Is the code compiles ? If yes then what will be the output ?
public class salesInvoices{ public static String formateID(String oldid){ return oldid+"_selsinvers"; } public static void main(String[] args) { salesInvoices s=new salesInvoices(); System.out.println( s.formateID("Hello")); } }
Output is:     Hello_selsinvers
Q. 4-Is the code compiles ? If yes then what will be the output ?
class Thing { public static int number_of_things = 0; public String what; public Thing (String what) { this.what = what; number_of_things++; System.out.println(number_of_things++ +","+what); } protected void finalize () { number_of_things--; } } public class TestDestructor { public static void main(String[] args) { Thing obj = new Thing("Test App"); } }
Output is:      1, Test App
Q. 5-Is the code compiles ? If yes then what will be the output ?
public class test { public static void main(String [] args) { try { badMethod(); System.out.print("A"); } catch (Exception ex) { System.out.print("B"); } finally { System.out.print("C"); } System.out.print("D"); } public static void badMethod() { throw new Error(); /* Line 22 */ } }
Output is:  Error in line number is 22 for java.lang.Error Then after output is C
Q. 6-Is the code compiles ? If yes then what will be the output ?
class newgensogt extends Thread { int code = 9; public void run() { this.code = 7; } public static void main(String[] args) { newgensogt n = new newgensogt(); n.start(); for (int i = 0; i < 5; i++) { System.out.println(n.code); } } }
Output is:     9 7 7 7 7
Q. 7-Is the code compiles ? If yes then what will be the output ?
class ex { static String r=""; public static void main(String[] args) { try { r+="1"; throw new Exception(); } catch (Exception e) { r+="2"; } finally{ r+="3"; dispaly();} System.out.println(r); } private static void dispaly() { int x=0; int y=7/x; /* Line 17 */ } }
Output is:   Error in line number is 17 for java.lang.ArithmeticException: / by zero

Q. 8-Is the code compiles ? If yes then what will be the output ?
class ntEX { static int i=1, k=2; static { display(i); } public static void main(String[] args) { ntEX obj=new ntEX(); display(k); obj.display(i); } static void display(int n) { System.out.println(n); } }
Output is:   1 2 1
Q. 9-Is the code compiles ? If yes then what will be the output ?
class subStringCons{ public static void main(String args[]){ byte b[]={77,65,78,79,74}; String s1=new String(b); System.out.println(s1); String s2=new String(b, 2, 3); System.out.println(s2); } }
Output is:             MANOJ
                                 NOJ
Q. 10-Is the code compiles ? If yes then what will be the output ?
class subString{ public static void main(String args[]){ String s="abc"; String s1=new String("abc"); if(s==s1){ System.out.println("1 String is Equals"); }else if(s.equals(s1)){ System.out.println("2 String is Equals"); }else{ System.out.println("String is not Equals");} } }
Output is:         2 String is Equals