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Flow Control

The following are keywords used to control the flow through a block of code : 

break : Its use in the block of code .

case : Its implement in a block of code, dependent on what the switch tests for.

continue : When its working in the block code its Stops the rest of the code following this statement from executing in a loop and then begins the next iteration of the loop.

default : Its implemented this block of code if none of the switch-case statements match.

do : Its implement a block of code one time, then, in conjunction with the while statement, It is executing a test to determine whether the block should be executed again.

else : Its implement an alternate block of code if an if test is false.

for : Its using perform a conditional loop for a block of code.

if : Its executing logical test for true or false.

instanceof : It is use fr the determining an object is an instance of a class, superclass, or interface.

return : When its use in the programs its use for the returns from a method without executing any code that follows the statement can optionally return a variable.

More interview questions and answers

What is right to way to declare array of primitives?

What happen when you compile and run following code: public class R4R { public static void main(String [] args) { signed int i = 7; for (int y=1; y<6; y++, x--) System.out.print(" Value of x will be " + x); } }

Which list has correct set of Java reserved keywords?

Which two are the valid string declaration?

Choose two options which is valid declaration of boolean?

Choose two options which are valid declaration in case of float?

What happen when you compile and run following code:(Choose three correct option) public class R4R { public static void main(String args[]) { for(int i = 5; i > 3; i--) { for(int j = 3; j<= 5; j++) { if(i == j) break; System.out.println(" Value of i = " + i + " Value of j = "+j); } } } }

How much bits and bytes are used by double primitive in Java?

Constructor of any class doesn't have any return type.

What happen when we compile and run following code: public class R4RSCJPtest { public static void main(String args[]) { int i,j=1; for(j=1;j<4;j++) { i = ((j>0) && (j<2))?2:1; switch(i) { case 0: System.out.print(0); break; case 1: System.out.print(1); break; case 2: System.out.print(2); case 3: System.out.print(3); break; case 4: System.out.print(4); break; } j++; } } }

Which are the legal array declarations?Choose three correct answer.

Which one is the correct range of long in Java?

What happen when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int i = 0; do { i++; } while (i < 3); System.out.println("Value of i is " +i); } }

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

How you can clean or delete workspace using Ant?

How we can set compile target using Ant? Or How we can compile source using ant?

How we can create a jar using Ant?

How we can run jar using ant?

How you can compile, jar and run into ant command prompt?

What is dependency? How it is used into ant? What is its use?

How you can explain ant property?

How we can echo message in Ant?

How many ways we can set properties into build ant file?

What is Built-in Properties? And how many Built-in Properties?Explain main.

How we can set path PATH and CLASSPATH into an ant build file?

Is Java interpreter used for the execution of the byte code?

In Java Programming when file is sucessfully compiled than class extension file is created.

If there are three classes in your Java file than number of class file will be.

Which declarations are essential for every Java application?

Give us two parts(in proper sequence) in executing a Java Program and their purposes?

What are the three OOPS Principle in Java Programing?

What happen we compile and execute following code: System.out.println("// Looks like a comment.");

In order for a source code file, containing the public class Test, to successfully compile, which of the following must be true?

What is return type of main() method in Java Program?

What is the argument type of main() method in Java Program?

Which type of comments are used in Java Programing?

Java supports multidimensional arrays.

Strings are instances of class String?

What is the value of a[3] as the result of the following array declaration?

Choose correct primitive type in Java?

Select two correct declaration and initialization(with four elements) of an array?

When happen when compile and run following code: public class R4RSCJPTest { public static void main(String [] args) { Test [][] ABC = new Test[2][]; System.out.println(ABC[1][0].toString()); } } class Test {}

Select two correct options from the followings.

Class, Method, and Variable Modifiers

Flow Control

Error Handling

Package Control

Primitives

Variable Keywords

void Return Type Keyword

Select three correct options than comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int i=1, j=1; try { i++; j--; if(i/j > 1) i++; } catch(ArithmeticException e) { System.out.println(0); } catch(ArrayIndexOutOfBoundsException e) { System.out.println(1); } catch(Exception e) { System.out.println(2); } finally { System.out.println(3); } System.out.println(4); } }

Select correct options that comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int i=2, j=1; try { i--; j++; if(i != j) i--; } catch(ArithmeticException e) { System.out.println(0); } catch(ArrayIndexOutOfBoundsException e) { System.out.println(1); } catch(Exception e) { System.out.println(2); } finally { System.out.println(3); } System.out.println(4); } }

What happen when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { String str1 = "xyz"; String str2 = new String("xyz"); if(str1 == str2) System.out.println(0); else System.out.println(1); if(str1.equals(str2)) System.out.println(2); else System.out.println(3); } }

What result comes when compile and run following code: public class Test { public static void main(String args[]) { String str1 = "xyz"; String str2 = "xyz"; if(str1 == str2) System.out.println(0); else System.out.println(1); if(str1.equals(str2)) System.out.println(2); else System.out.println(3); } }

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

In the following method at what stage does the object initially referenced by s becomes available for garbage collection? void method abc() { String str1 = new String("xyz"); String str2 = new String("xyz"); str1 = str1+1; //1 str1 = null; //2 str2 = str2 + str1; //3 } //4

From the following statement select two correct options.

Select two options which are correct in case of interface.

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int i; float f = 2.4f; i = ((int)Math.ceil(f)) * ((int) Math.floor(f)); System.out.println(i); } }

What result come when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int i; float f = 1.7f; double d1 = 2.7; double d2 = 2.4; i = ((int)Math.ceil(f)) * ((int)Math.round(d1)) * ((int)Math.round(d2)); System.out.println(i); } }

Which of these classes are defined in java.io and used for file handling are abstract.

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { String str1="abcd"; String str2="efgh"; String str3=str1.concat(str2); str1.concat(str2); System.out.println(str1); } }

What result comes when we compile and run following code: public class Test { public static void main(String args[]) { String str1="abcd"; String str2="efgh"; String str3=str1.concat(str2); str1 = str1.concat(str2); System.out.println(str1); } }

What result comes when we compile and run following code: public class Test { public static void main(String args[]) { String str1="abcd"; String str2="efgh"; String str3=str1.concat(str2); str1 = str1.concat(str2); System.out.println(str1); } }

What result comes when we compile and run following code: public class Test { public static void main(String args[]) { String str1="abcd"; String str2="efgh"; String str3=str1.concat(str2); str1 = str1.concat(str2); System.out.println(str1); } }

Literals and Ranges of All Primitive Data Types

Range of Primitive Types

Literal Values for All Primitive Types

Integer Literals

Decimal Literals

Octal Literals

Hexadecimal Literals

Floating-Point Literals

Boolean Literals

Character Literals

Literal Values for Strings

Which primitive type would be best to represent the number of stars in the universe? A) long B) char C) char [] D) int

Which primitive type would be best to represent a single multiple choice question on a test, with only one answer allowed? A) float B) int C) char [] D) char

Which primitive type would be best to represent a single multiple choice question on a test, with more than one answer allowed? A) char B) long C) char [] D) int

Which primitive type would be best to represent the population of the U.S. in 2003? A) int (or long ) B) float (or double) C) char D) long

Which primitive type would be best to represent the amount of money (in dollars and cents) you plan on having at retirement? A) char B) long C) int (or long) D) float (or double)

Array

Choose correct collection interface which we use to represent stored elements into in particular sequence order.

Declaring an Array

Constructing an Array

Select correct method which is defined in Object class and can also used to convert an Integer Object into primitive int type.

Which are the legal identifiers from below.Select three correct options.

Select correct width (in bits) of double primitive type in Java.

What result comes when we compile and run following code: public class R4RSCJPTest { public static void main(String args[]) { int x = 15, y; if(x < 15) y = 3; if(x>= 15) y = 4; System.out.println("Value of y is " + y); } }

Initializing an Array

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

Select three correct options related to Java programming language.

What result comes when we compile and run following code: class R4RSCJPTest { public static void main() { System.out.println("Welcome"); } }

Select correct options which is use to declare main method.

Initializing Elements in a Loop

Declaring, Constructing, and Initializing on One Line

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 = 3; y++; z = y = z = 2; System.out.println("Value of z is = "+z ); } }

Constructing and Initializing an Anonymous Array

Arrays of Primitives

Arrays of Object References

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