Amarnath Pandi

Hi,

There are lot of documents available in the Internet.

I've given one link here http://www.javaworld.com/javaworld/javaqa/2001-04/03-qa-0420-abstract.html

Hi Deepak,

Consider the packages as folders.

I have a package com.deepak.test that means I have a folder structure like com/deepak/test
I also have one more package com.deepak.test1 that means I have a folder structer like com/deepak/test1

If I have a class TestClass in both packages and I want to call this class from some other package.

When I want to import a TestClass from com/deepak/test1 folder. It is almost like giving the path of the class. JVM will search the same path in its classpath.
I'll mention "import com.deepak.test1.TestClass"

or if I want the TestClass in com/deepak/test then I'll mention as "import com.deepak.test.TestClass"

Hello Abhradeep,

After seeing your replies, I'd like to recommend you to go through the Java Tutorials. All the Best

Please try this program.

package carModel; import java.util.Scanner; class Database { private String CarList[] = { "Altis", "Vios", "Latio", "Murano", "Jazz", "Civic", "Stream", "Odyssey", "WRX", "Impressa" }; public String findCarByModel(String model) { String result=null; for(String car : CarList){ if(car.equalsIgnoreCase(model)){ result = car; } } return result; } } /*Car.java*/ class Car { private String regno; private String make; private String model; private int deposit; private int rate; // public static int calculateCost(int x) { // return int; // } public void setMake(String m) { make=m; } public String getMake() { Database myDatabase = new Database(); //return make; return myDatabase.findCarByModel(this.make); } } /*mainmethod.java*/ public class MainClass { public static void main(String args[]) { Car myCar = new Car(); // Scanner input = new Scanner(System.in); // System.out.print("Enter the model to rent: "); // myCar.setMake(input.nextLine()); myCar.setMake("Altis"); String make = myCar.getMake(); if (make == null) { System.out.print("Model not is available"); }else{ System.out.print("Model is available"); } } }

If you want to initialize and declare a variable inside while loop statement itself why don't you use the for loop itself to serve the purpose?

for(int i=0;i<MAX;){
//Code
i++; //Change the value of i
}

May be you should try to change the main method's argument name!

When you say A a = new B(); you mean class A only. A doesn't have a method called meth();

package Test; class A { public int x = 0; // void meth() { // } } class B extends A { public int y = 0; void meth() { } } public class C { public static void main(String[] args ) { A a = new B(); // Dynamic Method Dispatch System.out.println(a.x); //System.out.println(a.y);// causes a compile error //a.meth();// causes a compile error } }

From the object 'a' you cannot see the variable y.

Could you explain little more about the code.

in sortByPopulation,
You are comparing b[] but only swapping a and b. is it OK? In this case b[] values will not be changed right?
What is in a[] and b[]?

I've compiled the same code successfully.

Try to set the class path.

or

Try to use the full path before javac.
"c:\Program Files\Java\jdk1.6.0_02\bin\javac.exe" TestPassword.java
If the class TestPassword is in a package then you have to add the package in front of the class name.
"c:\Program Files\Java\jdk1.6.0_02\bin\javac.exe" package\TestPassword.java

If it compilation succeeded then try
"c:\Program Files\Java\jdk1.6.0_02\bin\java.exe" package.TestPassword

One more correction:
passwd.equals("joe") // I hope this code will not serve the purpose.

Are you using any IDE like eclipse? I think running the same class on a command line terminal shouldn't throw NPE.