Java, Java Technologies

Question: What would happen on trying to compile and run the following code?
class House { public final void MaintainMethod() { System.out.println("MaintainMethod"); } } public class Building extends House { public static void main(String argv[]) { House h = new House(); h.MaintainMethod(); } }
A
A runtime error will occur because class House is not defined as final.

B
Successful compilation and output of "MaintainMethod" at run time.

C
A compilation error indicating that a class with any final methods must be declared final itself.

D
A compilation error indicating that you cannot inherit from a class with final methods.

Note: Not available
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Question: Which of the following code snippets will generate five random numbers between 0 and 200?
A Random r = new Random(); 
for (int i = 0; i < 5; i++) {
 System.out.println(r.nextInt(0,200)); 
}

B Random r = new Random(200); 
for (int i = 0; i < 5; i++) { 
 System.out.println(r.nextInt()); 
}

C Random r = new Random(); 
for (int i = 0; i < 5; i++) { 
 System.out.println(r.nextInt(200)); 
}

D Random r = new Random(200); 
for (int i = 0; i < 5; i++) { 
System.out.println(r.nextInt(0)); 
}

Note: Not available

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Question: What will be the output when this code is compiled and run?public class Test {

 public Test() {

  Bar b = new Bar();
  Bar b1 = new Bar();
  update(b);
  update(b1);
  b1 = b;
  update(b);
  update(b1);
 }

 private void update(Bar bar) {

  bar.x = 20;
  System.out.println(bar.x);
 }

 public static void main(String args[]) {

  new Test();
 }

 private class Bar {

  int x = 10;
 }
}
AThe code will fail to compile

B10 10 10 10

C20 20 20 20

D10 20 10 20

Note: Not available

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Question: Which class contains a method to create a directory?
A
File

B
DataOutput

C
Directory

D
FileDescriptor

E
FileOutputStream

Note: Not available
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Question: What is the output of the given program?public class Test130 {
        public static void main(String[] args) {
                A a = new A2();
                B b = new B2();
                System.out.println(a.a + """" + b.b());
        }
}
class A {
        public int a = 1;
}
class A2 extends A { 
        public int a = 2;
}
class B { 
        public int b() { return 1; }
}
class B2 extends B { 
        public int b() { return 2; }
}
A11

B12

C21

D22

Note: Not available

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Question: Which of the following is the correct syntax for suggesting that the JVM perform garbage collection?
A
System.setGarbageCollection();

B
System.out.gc();

C
System.gc();

D
System.free();

Note: Not available
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Question: Why can't a Graphics object be created using the following statement? Graphics g = new Graphics();
A
The Graphics class is a final class.

B
The Graphics class is an abstract class.

C
The constructor of the Graphic class needs a color object to be passed as a parameter, e.g Graphics g = new Graphics(new Color());.

Note: Not available
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Question: Select all correct statements:
A
Vector is synchronized, ArrayList is not synchronized

B
Hashtable is synchronized, HashMap is not synchronized

C
Vector is not synchronized, ArrayList is synchronized

D
Hashtable is not synchronized, HashMap is synchronized

Note: Not available
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Question: What is the output of the given program?public class Test97 {
        public static void main(String[] args) {
                int[][] a = new int[2][2];
                System.out.println(a.length);
        }
}
A0

B2

C3

D4

Note: Not available

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Question: Which of the following is false?
A
A scrollable ResultSet can be created in JDBC 2.0 API.

B
The cursor is moved forward using next().

C
The cursor is moved backward using previous().

D
A while loop can be used because next() & previous() methods return false beyond the resultset.

E
A while loop can be used because next () & previous () methods return -1 beyond the resultset.

Note: Not available
1. Report

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Question: What would happen on trying to compile and run the following code?
class House { public final void MaintainMethod() { System.out.println("MaintainMethod"); } } public class Building extends House { public static void main(String argv[]) { House h = new House(); h.MaintainMethod(); } }

Question: Which of the following code snippets will generate five random numbers between 0 and 200?

Question: Which class contains a method to create a directory?

Question: Which of the following is the correct syntax for suggesting that the JVM perform garbage collection?

Question: Why can't a Graphics object be created using the following statement? Graphics g = new Graphics();

Question: Select all correct statements:

Question: What is the output of the given program?
public class Test97 { public static void main(String[] args) { int[][] a = new int[2][2]; System.out.println(a.length); } }

Question: Which of the following is false?

Question: What would happen on trying to compile and run the following code?class House { public final void MaintainMethod() { System.out.println("MaintainMethod"); } } public class Building extends House { public static void main(String argv[]) { House h = new House(); h.MaintainMethod(); } }

Question: Which of the following code snippets will generate five random numbers between 0 and 200?

Question: Which class contains a method to create a directory?

Question: Which of the following is the correct syntax for suggesting that the JVM perform garbage collection?

Question: Why can't a Graphics object be created using the following statement? Graphics g = new Graphics();

Question: Select all correct statements:

Question: What is the output of the given program?public class Test97 { public static void main(String[] args) { int[][] a = new int[2][2]; System.out.println(a.length); } }

Question: Which of the following is false?

Question: What would happen on trying to compile and run the following code?
class House { public final void MaintainMethod() { System.out.println("MaintainMethod"); } } public class Building extends House { public static void main(String argv[]) { House h = new House(); h.MaintainMethod(); } }

Question: What is the output of the given program?
public class Test97 { public static void main(String[] args) { int[][] a = new int[2][2]; System.out.println(a.length); } }