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real life example of package and file handling in java???

hi,my name is dayo.i am new to java programming i am bout to write my first program which i copied from a textbook i am reading.

// A program to display the message
// "Hello World!" on standard output

public class HelloWorld {

public static void main(String[] args) {
System.out.println("Hello World!");
}

} // end of class HelloWorld

but the compiler is giving an error system.out.print class.the compiler made a suggestion 1 should be a package class before it can be used by the compiler.pls i do i go about it.thank you.

Provide two alternatives (1 for loop and 1 while loop) to the loop in fig. 5.12 that does not change the programs output but also does not use a "break" statement. Modify the sample code below to have a single return statement. Prepare all three modifications in a Word document with a discussion as to why using break in this way as well as using multiple return statements is not considered good programming form by most in the field.

Sample Code:

public boolean isTheFirstOneBigger(int num1, int num2)
{
if (num1 > num2)
{
return true;
}

if (num1 <= num2)
{
return false;
}
}

Hi,
I'm new to java programming and i need the explanation why we use
public static void main(String args[])
and why we use "main" only rather than other word...please help me....

Below is the start of my program but i need to have the filename of yournamehw1.java.

import java.util.Scanner;

public class Divide {

public static void main (String args [] ) {

make kybd = new Scanner (System.in);

System.out.print("Enter number 1: ");

I want to output 0,1,1,2,3,5,8,13,21,34

I just need an example java program with at least 3 data fields, 2 constructors and 4 methods

How to write/start a class with 2 objects?

public static void main(String[] args)
{
Scanner console = new Scanner(System.in);
System.out.print("Enter the value of a: ");
int a = console.nextInt();
System.out.print("Enter the value of b: ");
int b = console.nextInt();
System.out.print("Enter the value of h: ");
int h = console.nextInt();
double area = (a + b) * h / 2;
System.out.println("Area = " + "(" + a + " + " + b + ")" + " * " + h + " / " + 2 );
System.out.println("Area = " + area);
if ( a > 0 || b > 0 || h > 0)
break;
int count = 0;
for (; n = area; n++)
{
count++;
}
System.out.println("The number of trapezium calculated: " + count);
System.out.println("End.");
}
How do I use scanner for this code and calculate & print the area of the trapezium as many time until the user key in a non-positive input.