PPS TEST 4

which of the following is wrapper class in java

• Float

• Integer

• Double

• all of above

Answer explanation

which one of the following is true?

• runnable interface declares the start method

• Thread.start() method is used to move a thread from a new state to the runnable state

• Thread.runnable() method is used to move a thread from new state to the runnable state

• Thread.run() method is used to move a thread from new state to the runnable state

Which one of the following statement is not true about the collection interface?

• all methods defined in set interface are also defined in collection interface

• list interface extends collection interface

• set interface extends collection interface

• all methods defined in list interface are also defined in collection interface

which one of the following is a legal decelration of a two- dimensional array of integers

• int[] a[] = new int[5][];

• int[5][5] a = new int[][];

• int a = new int[5,5];

• int[][] a = new int[][5];

which interface needs to be implemented in order to make an object seralized

• clonnable

• remote

• seralizable

• none of the above

superclass of all classes representing the output stream of characters is -------------

• OutputStream

• Reader

• InputStream

• Writer

which of this class is used by character streams for reading data from buffer

• BufferReader

• InputStreamReader

• FileReader

• FileInputStream

which one this keywords are used to create a class in java

• class

• struct

• int

• none of the avove

which one of these events will cause the thread to die?

• on calling the sleep() method.

• when the execution of the run() method ends

• when the execution of the start() method ends

• on calling the wait() method

What are the legal indexes for the array ar, given the following declaration:

int[] ar = {2, 4, 6, 8 }

•  0, 1, 2, 3
•  1, 2, 3, 4
• 2, 4, 6, 8
•  0, 2, 4, 6