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Interview Questions and Answers for 'Deutche bank' - 2 question(s) found
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Q1.
Draw uml for singleton pattern.
Design
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 design pattern   singleton
Asked in 1 Companies
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//Double Checked Locking Code
public static Singleton createInstance() {
if(singleton == null){
synchronized(Singleton.class) {
if(singleton == null) {
singleton = new Singleton();
}
}
}
return singleton;
}
//Single checked locking code
public static Singleton createInstance() {
synchronized(Singleton.class) {
if(singleton == null) {
singleton = new Singleton();
}
}
return singleton;
}
What are design situations to use Singleton and Prototype Design Pattern ?
How to avoid cloning, serialization in the singleton class ?
When singleton can break and how to resolve it
If you are given choice to either load object eagerly or lazily , which one would you use in case of singleton pattern ?
When should we use prototype scope and singleton scope for beans ?
Explain Singleton Design Pattern ?
Q2.
What is the use of HashCode in objects ?
Core Java
Ans. Hashcode is used for bucketing in Hash implementations like HashMap, HashTable, HashSet etc.
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 java   string   hashcode   hash code   string comparison  hashtable
Asked in 17 Companies
basic
 
frequent
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Which String class does not override the equals() and hashCode() methods, inheriting them directly from class Object?
Write a class and override the equals and hashcode method ?
How many threads can access a concurrent hashmap when the hashcode is overridden and always returns a zero.
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