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Public Members

public members is used when the method or variable member is declared  public . ts means all other classes reardless of the packages they belong to the access .we can see the following code : 

package book;
import cert.*; // Import all classes in the cert package
class Goo {
public static void main(String [] args) {
Sludge o = new Sludge();
o.testIt();
}
}

Now we can see rhe second file :

package cert;
public class Sludge {
public void testIt() {
System.out.println(\"sludge\");
}
}


We can see in the code Goo and Sludge are in different packages.Goo packages basically use for the invoke the method in Sludge without problems because both the Sludge class and its testIt() method are marked public.

More interview questions and answers

Arrays of Primitives

Arrays of Object References

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int x, y; int z = 4; z++; y = 4; y++; z+= y-= x = 2; if( z == 6) z-= 3; else z+= 3; System.out.println("Value of z is "+z ); } }

Array Reference Assignments for One-Dimensional Arrays

Array Reference Assignments for Multidimensional Arrays

Using a Variable or Array Element That Is Uninitialized and Unassigned

What result comes when we compile and run following code: public class R4RSCJPTest { int i = 1; public static void main(String args[]) { int i = 2; i = new_i(i); System.out.println("New value of i is " +i); } public static int new_i(int i) { i = 3; i *= 4; return i; } }

What result comes when we compile and run following code: public class R4RSCJPTest { int i = 1; public static void main(String args[]) { int i = 2; new_i(i); System.out.println("New value of i is " +i); } public static void new_i(int i) { i = 3; i *= 4; } }

What result comes when we compile and run following code: public class R4RSCJPTest { int i[] = {0}; public static void main(String args[]) { int i[] = {1}; new_i(i); System.out.println("New value of i[0] is " +i[0]); } public static void new_i(int i[]) { i[0] = 2; i[0] *= 3; } }

What result comes when we compile and run(with command line argument R4R welcome in intellegence world. in following code: public class R4RSCJPTest { public static void main(String args[]) { System.out.println(args[0]+" "+args [args.length-1]); } }

What result comes when we compile and run(with command line argument like: R4R welcomes you in intelligence world) following code: public class test { public static void main(String args[]) { System.out.println(args[0]+" "+args.length); } }

What result comes when we compile and run following code: class R4RSCJPTest { public static void main(String args[]) { int i,j,k,l=0; k = l++; j = ++k; i = --j; System.out.println("Value of i is " +i); } }

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { char c; int i; c = 'A'; //1 i = c; //2 c = i + 1; //3 i++; //4 } }

Select correct signed of left shift operator.

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int i = 1; boolean t = true; boolean f = false, boo; boo = (t && ((i++) == 0)); boo = (f && ((i+=2) > 0)); System.out.println("Value of i is " +i); } }

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int i = 1; boolean t = true; boolean f = false, boo; boo = (t & ((i++) == 0)); boo = (f & ((i+=2) > 0)); System.out.println("Value of i is " +i); } }

Primitive Instance Variables

Object Reference Instance Variables

Array Instance Variables

Local Primitives

Local Objects

Local Arrays

Command-Line Arguments to Main

Declarations and Modifiers

Class Declarations and Modifiers

Class Access

Default Access

Public Access

Other (Nonaccess) Class Modifiers

Final Classes

Abstract Classes

Creating an Abstract Superclass and Concrete Subclass

Method and Variable Declarations and Modifiers.

Member Access

Public Members

Private Members

Local Variables and Access Modifiers

Nonaccess Member Modifiers

Final Methods

Final Arguments

What result comes when we compile and following code: public class R4RSCJPTest { public static void main(String args[]) { byte i = 4; i = (byte)~i; System.out.println("Value of i is " +i); } }

Select operator which we use in Java for bitwise inversion.

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int i,j; i = 1 & 5; j = 2 | 7; System.out.println("Value of i is " + i + ", Value of j is " + j ); } }

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int i = -1; int j = i>>3; int k = j & 129; System.out.println("Value of k is " +k); } }

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int i,j; i = 1 | 5 ; j = 2 ^ 7; System.out.println("Value of i is " + i + ", Value of j is " + j); } }

Synchronized Methods

Native Methods

Strictfp Methods

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { boolean boo = true; int i; if(boo) i = boo ? 3: 2; else i = boo ? 4: 1; System.out.println("Value of i is " +i); } }

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { boolean boo = false; int i; if(boo) i = boo ? 3: 2; else i = boo ? 4: 1; System.out.println("Value of i is " +i); } }

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int i = 0; if(i < 0) i = 1; switch(i) { case 2: System.out.println(2); case 0: System.out.println(0); case 1: System.out.println(1); break; case 3: System.out.println(3); default: System.out.println(4); break; } } }

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int i, j; i = 7 >> 2; j = 7 >>> 2; System.out.println("Value of i is " +i+",Value of j is " +j); } }

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int i; i = -2 << 1; i = i >> 3; i = i >>> 2; System.out.println("Value of i is " +i); } }

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int i; i = -2 << 1; i = i >>> 2; i = i >> 1; System.out.println("Value of i is " +i); } }

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int i = -4; i = i << 2; System.out.println("Value of i is " +i); } }

Select correct signed right shift operator from following.

Select shift operator which are not used in Java.

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int i = 0, J = 1, k; if(i) k = 2; else k = 1; if(j) k = 0; else k = 3; System.out.println("Value of k is " +k); } }

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { for(int i = 0; i < 2; i++) { for(int j = 1; j >= 0; j--) { if(i == j) continue; System.out.println("Value of i is "+ i + ", Value of j is " + j); } } } }

What result comes when we compile and run following code: public class Test { public static void main(String args[]) { for(int i = 0; i < 2; i++) { for(int j = 1; j >= 0; j--) { if(i == j) break; System.out.println("Value of i is "+ i + ", Value of j is " + j); } } } }

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { outer: for(int i = 0; i < 2; i++) { for(int j = 2; j >= 0; j--) { if(i == j) continue outer; System.out.println("Value of i is " +i+ ", Value of j is " +j); } } } }

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { outer: for(int i = 0; i < 2; i++) { for(int j = 2; j >= 0; j--) { if(i == j) break outer; System.out.println("Value of i is " +i+ ", Value of j is " +j); } } } }

Variable Declarations

Instance Variables

Local (Automatic/Stack/Method) Variables

Final Variables

Transient Variables

Volatile Variables

Static Variables and Methods

Accessing Static Methods and Variables

Declaration Rules

Source File Structure

Using Import Statements

Formatting the main() Method

Interface Implementation

Declaring an Interface

Declaring Interface Constants

Implementing an Interface

What result comes when we compile and run following code: class Test { public static void main(String args[]) { int arr[] = new int[2]; System.out.println(arr[0]); } }

Select legal declaration and defination of a method.

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int i = 1; int j = 0; boolean boo = true; boolean boo1; boo1 = (boo && 0<(i+=2)); boo1 = (boo && 0<(i+=1)); boo1 = (boo && 0<(j+=2)); boo1 = (boo || 0<(j+=1)); System.out.println("Value of i is " + i + ", Value of j is " + j ); } }

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int i = 1; int j = 0; boolean boo = false; boolean boo1; boo1 = (boo && 0<(i+=2)); boo1 = (boo && 0<(i+=1)); boo1 = (boo && 0<(j+=2)); boo1 = (boo || 0<(j+=1)); System.out.println("Value of i is " + i + ", Value of j is " + j ); } }

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { char A = '\u0005'; if ( A == 0x0005L ) System.out.println("Equal"); else System.out.println("Not Equal"); } }

What result comes when we compile and run following code: class R4RSCJPTest { public void methodTest(int i) { System.out.println("Value of i is " +i); } public int methodTest(int i) { System.out.println("Value of i+1 is " + (i+1)); return (i+1); } public static void main(String args[]) { R4RSCJPTest a = new R4RSCJPTest(); a.methodTest(4); } }

What result comes when we compile and run following code: class R4RSCJPTest { public static void main(String arg[]) { int a[]={2,2}; int b=0; a[b]=b=1; System.out.println(a[0]); System.out.println(a[1]); } }

Select two valid character contants from followings.

Select correct statement to execute given program: public class R4RSCJPTest { int planets; static int suns; public void gaze() { int i; // .... write statements here .... } }

Select all valid statement from followings.

Select the valid ways which refer to the class from outside the package net.codemaster. package net.codemaster; public class code { // ...Write some statements here... }

public class myprog { public static void main(String [] args) { signed int a = 20; for (int b=0; b<10; b++, a--) System.out.print(" " + a); } }

What result comes when we compile and run following code: protected class R4RSCJPTest { public static void main(String args[]) { String str1 = "xyz", str2 = "pqr",str; str = str1 + str2; System.out.println(str); } }

Which word is reserved word in the Java programming language in the following option?

Which one of these lists contains only Java programming language keywords?

Which two are keywords?

A top level class without any modifier is accessible by....... (Select most appropriate answer)

Which three are valid declarations of a char?

Which two are valid declarations of a String?

Which one is a valid declaration of a boolean?

What is the numerical range of a char?

Which three are valid declarations of a float?

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