Java - Online Test - Object equality - javasearch.buggybread.com

Java - Test Questions on 'object equality' - 6 questions found

What will be the output of following ?

String str1 = new String("String1");
String str2 = new String("String1");
System.out.print(str1 == str2);
System.out.print(str1.equals(str2));
str1 = str2;
System.out.print(str1 == str2);

Core Java

falsetruetrue

truetruetrue

truetruefalse

falsetruefalse

_{equals object equality}

What will be the output of following code ?

String str1 = "String1";
String str2 = "String1";
System.out.print(str1 == str2);
System.out.print(str1.equals(str2));
str1 = str2;
System.out.print(str1 == str2);

Core Java

falsetruetrue

falsefalsetrue

truetruetrue

falsefalsefalse

_{equals object equality string pool}

Which of the following statement is not true ?

Reference

Core Java

x==y means they are pointing to the same object

x==y means that they hold same information

x.equals(y) means they are pointing to the same object

x.equals(y) means that they hold same information

When String literals are compared using ==, they always returns true if the string values are same because ..

Reference

Core Java

of overridden compareTo method

of overridden compare method

of String Pool

== means that the object contents are equal

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

What will be the output of following code ?

String str1 = "String1";
String str2 = "String2";
str1=str1.concat("String3");
System.out.print(str1);
System.out.print(str2);

Core Java

String1String2

String1String3String2

String1String2String3

String1Stringg3String1

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