INTERVIEW QUESTIONS J2EE JAVA DETAILS

Question: What’s the difference between comparison done by equals method and == operator?

Answer: equals() method is used to compare the contents of two string objects and returns true if the two have same value while == operator compares the references of two string objects.

In the following example, equals() returns true as the two string objects have same values. However == operator returns false as both string objects are referencing to different objects:


public class equalsTest {

public static void main(String args[]) {

String srt1="Hello World";

String str2="Hello World";

if (str1.equals(str2))

{// this condition is true

System.out.println("str1 and str2 are equal in terms of values");

}

if (str1==str2) {

//This condition is not true

System.out.println("Both strings are referencing same object");

}

else

{

// This condition is true

System.out.println("Both strings are referencing different objects");

}

}}
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public class equalsTest {

public static void main(String args[]) {

String srt1="Hello World";

String str2="Hello World";

if (str1.equals(str2))

{// this condition is true

System.out.println("str1 and str2 are equal in terms of values");

}

if (str1==str2) {

//This condition is not true

System.out.println("Both strings are referencing same object");

}

else

{

// This condition is true

System.out.println("Both strings are referencing different objects");

}

equals() method is used to compare the contents of two string objects and returns true if the two have same value while == operator compares the references of two string objects.

In the following example, equals() returns true as the two string objects have same values. However == operator returns false as both string objects are referencing to different objects:


public class equalsTest {

public static void main(String args[]) {

String srt1="Hello World";

String str2="Hello World";

if (str1.equals(str2))

{// this condition is true

System.out.println("str1 and str2 are equal in terms of values");

}

if (str1==str2) {

//This condition is not true

System.out.println("Both strings are referencing same object");

}

else

{

// This condition is true

System.out.println("Both strings are referencing different objects");

}

}}
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public class equalsTest {

public static void main(String args[]) {

String srt1="Hello World";

String str2="Hello World";

if (str1.equals(str2))

{// this condition is true

System.out.println("str1 and str2 are equal in terms of values");

}

if (str1==str2) {

//This condition is not true

System.out.println("Both strings are referencing same object");

}

else

{

// This condition is true

System.out.println("Both strings are referencing different objects");

}
Source: CoolInterview.com

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