Core Java - Interview Questions and Answers for 'System cla' | Search Interview Question

Core Java - Interview Questions and Answers for 'System cla' - 3 question(s) found - Order By Rating

Q1. Difference between System.out.printf and System.out.println ?

Core Java

Ans. println prints an additional end of line whereas printf doesnt.

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What are various types of Class loaders used by JVM ?

What is a Deadlock ?

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Difference between Process and Thread ?

Will the static block be executed in the following code ? Why ?

Which of the following syntax is correct ?import static java.lang.System.*;or static import java.lang.System.*;

What will happen if we call perform(null) ?

public void perform(Object obj) {
System.out.println("Object");
}

public void perform(Integer int) {
System.out.println("Integer");
}

What will be the output of following code ?

System.out.println((int)'a');

What will be the output of

System.out.println((Integer)'a');

What is System.in in Java ?

Q2. Explain System.out.println ?

Core Java

Ans. System is a class within java.lang package that contains several useful class fields and methods. It cannot be instantiated and hence can use only statically.even in this case this has been used statically i.e with class name itself and without creating an instance.

out is the static reference of Printstream declared as following in the System Class -

public final static PrintStream out = null;

println is the method of PrintStream class.

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Related Questions

What are various types of Class loaders used by JVM ?

What is a Deadlock ?

What is the difference between time slicing and preemptive scheduling ?

Difference between Process and Thread ?

Will the static block be executed in the following code ? Why ?

Which of the following syntax is correct ?import static java.lang.System.*;or static import java.lang.System.*;

What will happen if we call perform(null) ?

public void perform(Object obj) {
System.out.println("Object");
}

public void perform(Integer int) {
System.out.println("Integer");
}

What will be the output of following code ?

System.out.println((int)'a');

What will be the output of

System.out.println((Integer)'a');

What is System.in in Java ?

Q3. What is the difference between System.console.write and System.out.println ?

Ans. System.console() returns null if your application is not run in a terminal (though you can handle this in your application)System.console() provides methods for reading password without echoing charactersSystem.out and System.err use the default platform encoding, while the Console class output methods use the console encoding

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Name few Buffered IO classes and interfaces ?

Name few Writer classes ?

Name few Reader classes ?

Difference between Scanner and BufferedReader ? Which one is faster and Why ?

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