QuipoIn

Java - String overview

Which of the following statements about Strings in Java is TRUE?

A. Strings are mutable objects 

B. Strings are immutable objects 

C. Strings are primitive data types 

D. Strings cannot be compared

What will be the output of the following code?

String s1 = "Java";

String s2 = "Java";

System.out.println(s1 == s2);

A. true

B. false

C. Compilation error

D. Runtime error

Which method is used to compare the content of two strings in Java?

A. == 

B. equals() 

C. compare() 

D. match()

Which of the following is the correct output?

String s = "Programming";

System.out.println(s.substring(3, 6));

A. Pro

B. gra

C. none

D. gram

Which class is used when we need a mutable string in Java?

A. String 

B. StringBuilder / StringBuffer 

C. CharSequence 

D. MutableString