Agile Java Questions

java:
(1)find out three keywords
(a)synchronized
(b)implement
(c)throws

etc
(2)which are not keywords
(a)NULL
(b)synchronize
etc

(3)two to three questions on legal array declaration
(a)int a[][]=new int[3][3];
(b)int[] a[]=new int[3][3];
(c)int a[3][4]=new int[3][4];wrong
(d)int[3][4] a=new int[3][4];wrong
(e)int a[][]=new int[3][4];

(4)++i+++j is equivalent to
(a)i+j+1
(b)i+j+2
(c)i+j
(d)can’t be compiled(correct)

(5)the content of the array after execution of following statement:int a[][]=new int[3][3];
(a)all elements contain zeros

(6)find legal statements
(a)int a=30;
(b)float f=1.4;(error)
(c)double d=34.5;
(d)byte b=128;(error)

(7)find illegal statements
(a)int i=’2′;
(b)char a=12;

(8)some 5 questions on collection interfaces

(9)to find the length of array
(a)arr.length-1
(b)arr.length(correct)
(c)arr.length()

(10)write code for accessing array length without assigning it to another variable

(11)recursion is
(a)any function which refer itself

(12)the sorting method which don’t generally use recursion
(a)heap sort
(b)bubble sort(ans)
(c)quick sort
(d)bubble sort

(13)one questions regarding abstract

(14)some 2 questions on hash table