Java Programming

There are two ways. The method can have a try catch block and handle the error/exception inside the method. Or The method can throw the exception under the assumption that the calling method would have the code to handle the exception that is thrown by this method

First of all the compiler converts our source code into byte code ,this is done by "javac" compiler.then we use interpretor that is the"java interpretor" for making our byte code executed.thats y java is called as an compiled and interpred language.by that way our java program will be interpreted. First of all our source code vl b converted into byte code by da java compiler named "javac" ,then dt byte code vl be executed by da interpretor named "java" interpretor. These are execution steps in java dts y v call java as a compiled and interpreted language.

import java.util.Scanner;

import java.io.File;

public class Filedemo {

public static void main(String[] args)

{

Scanner input=new Scanner(System.in);

String s=input.nextLine();

File f1=new File(s);

System.out.println("File Name:"+f1.getName());

System.out.println("Path:"+f1.getPath());

System.out.println("Abs Path:"+f1.getAbsolutePath());

System.out.println("Parent:"+f1.getParent());

System.out.println("This file is:"+(f1.exists()?"Exists":"Does not exists"));

System.out.println("Is file:"+f1.isFile());

System.out.println("Is Directory:"+f1.isDirectory());

System.out.println("Is Readable:"+f1.canRead());

System.out.println("IS Writable:"+f1.canWrite());

System.out.println("Is Absolute:"+f1.isAbsolute());

System.out.println("File Last Modified:"+f1.lastModified());

System.out.println("File Size:"+f1.length()+"bytes");

System.out.println("Is Hidden:"+f1.isHidden());

}

}

// get input

char input[256];

gets(input);

// print one character on each line

int i;

for(i = 0; input[i] != '\0'; ++i) {

printf("%c\n", input[i]);

}

basically packages are a collection or a directory of similar classes.

there are some inbuilt packages in java which prove to be really useful like the java.lang package which automatically is imported into your program.

in addition you can also create your own packages and its really simple to create them! :)

import java.io.*;

class aeven

{

public static void main(String[] args)

{

try{

BufferedReader br1 = new BufferedReader(new InputStreamReader(System.in));

System.out.println("Enter 1st number : ");

int num1 = Integer.parseInt(br1.readLine());

System.out.println("Enter 2nd number : ");

int num2 = Integer.parseInt(br1.readLine());

System.out.println("Odd Numbers : ");

for (int i=num1;i <=num2 ; i++)

{

if(i%2!=0 )

{

System.out.print(i+ ", ");

}

}

}

catch(Exception e){}

}

}

Java does not support multiple inheritance.......

String passage= new String("blah blah blah");

int vowelSum=0;

for(int i=0;i<passage.length();i++)

if(passage.charAt(i)=='a' passage.charAt(i)=='e' ...etc....

vowelSum+=1;

System.out.println(vowelSum);

That is a basic idea and in no way the best possible way to do it.

JBuck

The only difference is that an if statement will be evaluated at most one time and a while statement will be evaluated repeatedly until the loop condition evaluates to false.

The value must be unique enough that it will not be mistaken as a regular value in the list.

All data is stored in a computer as 0s and 1s. In order to make this more efficient, certain sets of bits can mean different things depending on what the data type is. Some languages, such as Java, make sure the programmer doesn't confuse these types and mess up the data. However, other languages allow you to do things like multiply a string and an array. If you don't pay careful attention to data types, you can easily end up with useless data.

Let us first define a generic Shape class. This will be an abstract class, since the term "shape" is, itself, very abstract.

Let us also assume that this shape is defined in only two dimensions, for the sake of simplicity.

abstract class Shape {

/*

One of the properties of any 2D shape is the area it takes up. Since calculating the area depends on the shape, we'll make this method abstract - all subclasses should implement it differently.

*/

abstract int getArea();

}

Now that we have our base class defined, we can create a rectangle subclass.

class Rectangle extends Shape {

/*

While a rectangle has other properties, we are really only interested in the ones required to calculate the area - width and height.

*/

int width;

int height;

/*

What's the area of a rectangular shape?

area = width x height

*/

int getArea() {

return width*height;

}

}

If two numbers are involved in a calculation (in this case a multiplication), the result is converted to the more precise data type, to avoid data loss. Even though between long and double data can be lost in either direction, a number with decimals (such as double) is generally considered to be more precise than a number without decimals (such as long). Even though languages such as Java also have a "float" data type, "double" is normally used by default in cases such as these, because of the greater precision. However, you can convert explicitly to float, if you like, using a cast. (Float uses 4 bytes, while double uses 8 bytes.)

The function header. The return value is written before the name of the function. This return type must match the type of the value returned in a return statement.

2

<float_literals> -> <digit> { <digit> } [ . ] [ { <digit> } ]

<digit> -> "0" | <digit excluding zero>

<digit excluding zero> -> "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"

hi dude

i wish you are satisfied with my answer

LOL ^^

bool (lowercase, built-in type) has an unspecified size, but is typically 1 byte. When in doubt, use sizeof( <type> ) to determine the byte count of any data type.

Yes.

Using the method InetAddress.getByName( String name) for instance.

There is no "recommended system". Java is meant to be run in many different environments or systems. It is not designed preferentially for Windows, Linux, desktop computers, smartphones, or any other system. For some newer Java programs, you need to have sufficient RAM memory, and perhaps processor speed, to run them sufficiently fast, but this may vary, depending on the complexity of the program. A Java program may be anything from (for example) a simple calculator app or an interactive graph to show some physical principle, to a game with a 3D world, such as RuneScape (which was designed with Java).

"post" method