Strings quiz

What is the output?

String s1 = "hello";

String s2 = "hel" + "lo";

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

• true

• false

• compile time error

• runtime error

What does the following return?

String s1 = "hello";

String s2 = "hel";

String s3 = s2 + "lo";

System.out.println(s1 == s3);

• true

• false

• compile time error

• runtime error

What is the output?

String s = "Java";

s.concat("World");

System.out.println(s);

• JavaWorld

• Java

• World

• Compiler error

What is the result of the code?

String str1 = new String("Test");

String str2 = str1.intern();

System.out.println(str1 == str2);

• true

• false

• compiler error

• runtime error

Which method removes whitespace from both ends of a string?

• removeWhiteSpace()
  

• strip()

• trim()

• deleteSpace()

What does String.valueOf(123) return?

• 123 as int

• 123.0

• "123"

• Compilation error

What will this print?

String s = " ";

System.out.println(s.isBlank());

• true

• false

• compiler error

• exception

What will be the output?

String s = "OpenAI";

System.out.println(s.charAt(s.length()));

• I

• Compiler error

• IndexOutOfBoundsException
  

• A

What is printed?

String s = "abc";

StringBuilder sb = new StringBuilder(s);

sb.reverse();

System.out.println(sb);

• abc

• cba

• Compilation error

• Runtime error

What does this output?

String s = "hello";

System.out.println(s.replace('l', 'x'));

• hexxo

• hexxlo

• hexxlx

• hexxl