Write a regular expression to validate a password. A password must start with an alphabet and followed by alphanumeric characters; its length must be in between 8 to 20.

977

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How to perform merge sort in java?

1002

---

What is a lightweight component?

975

---

What are the types of inner classes (non-static nested class) used in java?

1013

---

How to make a write-only class in java?

1014

---

How many types of exception can occur in a java program?

929

---

What are the differences between this and super keyword?

898

---

Do I need to import java.lang package any time? Why?

1314

---

Why are the objects immutable in java?

939

---

Can we modify the throws clause of the superclass method while overriding it in the subclass?

997

---

How can you avoid serialization in child class if the base class is implementing the serializable interface?

1025

---

Can you make a constructor final?

980

---

How can constructor chaining be done by using the super keyword?

1040

---

What do you understand by copy constructor in java?

882

---

What is the final blank variable?

1073

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