JAVA CONCEPTS

Important Java Mcq 1

What will be printed as the output of the following program?

public class testincr
 {
         public static void main(String args[])
 {
                 	int i = 0;
                 	i = i++ + i;
                 	System.out.println("I = " +i);
      	}
  }

a. l = 0

b. I = 1

c. l = 2

d. l = 3

Answer:

b. I = 1

Explanation

The execution goes on like this:

int i = 0;	        //  i is set to 0
i = 1 + i;         // i in incremented by 1 so i value is 1

In print statement 1 will be printed.

What is the fundamental unit of information of writer streams?

a. Characters b. Bytes c. Files d. Records Answer: a. Characters Explanation: Writer streams use characters as their fundamental unit of information.

Every Java application is composed of at least one?

a. Local variable b. Instance variable c. Public class declaration d. Imported class Answer: c. Public class declaration Explanation In any Java program there must

What is used to document a program and improve its readability?

a. Keyword b. Comment c. Control Structure d. Block Answer: b. Comment Explanation Comment can be used to explain Java code, and to make it

Which of the following is the correct statement to return java?

a. toUpperCase(“Java”) b. “Java”.toUpperCase(“Java”) c. “Java”.toUpperCase() d. String.toUpperCase(“Java”) Answer: C. “Java”.toUpperCase() Explanation: “Java”.toUpperCase() is the correct statement used to return Java.