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Core Java Interview Questions and Answers

Ques 81. What are the implicit packages that need not get imported into a class file?

Ans. java.lang

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Ques 82. What is the difference between lightweight and heavyweight component?
Ans. Lightweight components reuses its parents graphical units. Heavyweight components goes with the native graphical unit for every component. Lightweight components are faster than the heavyweight components.
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Ques 83. What are the ways in which you can instantiate a thread?
Ans. Using Thread class By implementing the Runnable interface and giving that handle to the Thread class.

class RunnableThread implements Runnable {

Thread runner;
public RunnableThread() {
}
public RunnableThread(String threadName) {
runner = new Thread(this, threadName); // (1) Create a new thread.
System.out.println(runner.getName());
runner.start(); // (2) Start the thread.
}
public void run() {
//Display info about this particular thread
System.out.println(Thread.currentThread());
}
}
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Ques 84. What are the states of a thread?
Ans. A thread state. A thread can be in one of the following states:
  • NEW
    A thread that has not yet started is in this state.
  • RUNNABLE
    A thread executing in the Java virtual machine is in this state.
  • BLOCKED
    A thread that is blocked waiting for a monitor lock is in this state.
  • WAITING
    A thread that is waiting indefinitely for another thread to perform a particular action is in this state.
  • TIMED_WAITING
    A thread that is waiting for another thread to perform an action for up to a specified waiting time is in this state.
  • TERMINATED
    A thread that has exited is in this state.

A thread can be in only one state at a given point in time. These states are virtual machine states which do not reflect any operating system thread states.

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Ques 85. What is a socket?
Ans. A socket is an endpoint for communication between two machines.
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