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Java - Test Questions on 'Echostar' - 5 questions found


Which of the following class creates mutable objects ?Core Java
Boolean
File
String
StringBuffer

  java  immutable

When String literals are compared using ==, they always returns true if the string values are same because .. Core Java
of overridden compareTo method
of overridden compare method
of String Pool
== means that the object contents are equal

  

In case of String Literals ..Core Java
x==y on all literals always returns false
x.equals(y) on all literals always returns false
if x.equals(y) returns true, x==y returns true too
if x.equals(y) returns false, x==y returns true

  

What will be the output of following code ?

String str1 = "String1";
String str2 = "String2";
str1.concat("String3");
System.out.print(str1);
System.out.print(str2);
Core Java
String1String2
String1String3String3
String1String3String1String3
String1String1

  

The use of volatile keyword facilitates ..Core Java
Making Use of Cache for better Performance
Avoiding use of Cache
Making use of Backward as well as Forward Cache
Keeping only one copy of variable in Cache

  volatile  java keywords







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