When can you say a graph to be a tree?

0 Answers   Amazon,

---

What is a map in java?

0 Answers  

---

What is meant by call by reference?

0 Answers  

---

Can we write a class without main method in java?

0 Answers  

---

Does unicode support all languages?

0 Answers  

---

Where are the local variables stored?

0 Answers  

---

Explain different types of thread priorities ?

0 Answers  

---

public class AboutStrings{ public static void main(String args[]){ String s1="hello"; String s2="hel"; String s3="lo"; String s4=s2+s3; //to know the hash codes of s1,s4. System.out.println(s1.hashCode()); System.out.println(s4.hashCode()); // these two s1 and s4 are having same hashcodes. if(s1==s4){ System.out.println("s1 and s4 are same."); }else System.out.println("s1 and s4 are not same."); } } Somebody told me that, == operator compares references of the objects. In the above example even though s1 and s4 are refering to same object(having same hash codes), it is printing s1 and s4 are not same. Can anybody explain in detail why it is behaving like this? Thanks in Advance RavuriVinod

4 Answers   TCS,

---

Is empty list java?

0 Answers  

---

There are two classes named classa and classb. Both classes are in the same package. Can a private member of classa can be accessed by an object of classb?

0 Answers  

---

What is data abstraction? Elaborate with example?

4 Answers   BMC, TCS,

---

i need to know the site which compiles and run the java program completely in online... thank you for your reply in advance

2 Answers  

---