public variables ()
{
String name = "Jason";
String surname = "BoTHa";
(...)
JOptionPane.showConfirmDialog(null,name);
}
class firstClass {
//something here
public int something() {
int variable1 = 2;
int variable2 = 3;
}
}
class anotherClass {
//some stuff happens here
}import java.util.*;
public class SortedList<E extends Comparable<? super E>> implements Iterable {
private LinkedList<E> theList;
private boolean duplicates;
public SortedList() {
this.theList = new LinkedList<E>();
this.duplicates = true;
}
public SortedList(boolean d) {
this.theList = new LinkedList<E>();
this.duplicates = d;
}
public boolean insert(E x) {
if (!this.theList.isEmpty()) {
for (ListIterator<E> i = this.theList.listIterator(); i.hasNext(); ) {
E temp = i.next();
if (temp.compareTo(x) == 0 && !this.duplicates) {
return false;
}
if (temp.compareTo(x) >= 0) {
//as-ful implementation
i.remove();
i.add(x);
i.add(temp);
return true;
}
}
this.theList.add(x);
return true;
} else {
this.theList.add(x);
return true;
}
}
public void remove(E x) {
if(!this.theList.isEmpty()) {
for (ListIterator<E> i = this.theList.listIterator(); i.hasNext(); ) {
if(i.next().compareTo(x) == 0) {
i.remove();
}
}
}
}
public E find(E x) {
if(!this.theList.isEmpty()) {
for (ListIterator<E> i = this.theList.listIterator(); i.hasNext(); ) {
E temp = i.next();
if(temp.compareTo(x) == 0) {
return temp;
}
}
}
return null;
}
public int size() {
return this.theList.size();
}
public boolean isEmpty() {
return this.theList.isEmpty();
}
public Iterator iterator() {
// TODO Auto-generated method stub
return this.theList.iterator();
}
}//
// Learning.java
// Learning
//
// Created by Jason on 2006/09/18.
// Copyright (c) 2006 __MyCompanyName__. All rights reserved.
//
import javax.swing.*;
public class Learning
{
public Learning()
{
//values
String noa = "";
String nob = "";
double answer = 0;
//other
String header = "Calculator";
float number = 1345213f;
int hi1 = 31254;
int hi2 = 345;
double hi3 = hi1/hi2;
char yes= 'y';
//First digit
noa = JOptionPane.showInputDialog(null, "value 1?", "What do u wanna know?", JOptionPane.QUESTION_MESSAGE);
JOptionPane.showConfirmDialog(null,"Your number = "+noa , "number1", JOptionPane.PLAIN_MESSAGE, JOptionPane.PLAIN_MESSAGE);
//Second Digit
nob = JOptionPane.showInputDialog(null, "value 2?", "What do u wanna know?", JOptionPane.QUESTION_MESSAGE);
JOptionPane.showConfirmDialog(null,"Your number = "+nob ,"number2", JOptionPane.PLAIN_MESSAGE, JOptionPane.PLAIN_MESSAGE);
//Maths
double a = Double.parseDouble(noa);
double b = Double.parseDouble(nob);
double ans = a*b;
//Your answer
JOptionPane.showConfirmDialog(null, "Number 1 = " +noa +"\nNumber 2 = " +nob +"\n" +noa +" x " +nob +"="+ans, "ANSWER", JOptionPane.PLAIN_MESSAGE, JOptionPane.INFORMATION_MESSAGE);
//if test
if(ans < 300)
{
JOptionPane.showMessageDialog(null,"Low number");
}
else if (ans > 900)
{
JOptionPane.showMessageDialog(null, "High Number");
}
else
{
JOptionPane.showMessageDialog(null, "Medium number");
}
}
public static void main(String args[])
{
new Learning ();
}
}
public class Rectangle
{
float width, height;
public Rectangle
{
this(0.0); // If no size is given the create a rectangle with a width=height=0.0
}
public Rectangle(float size)
{
this(size,size); // If only one size is given create a square
}
public Rectangle(float width, float height)
{
this.width = width;
this.height = height;
}
}import javax.swing.*;
public class variables
{
public variables ()
{
String name = "Jason";
String surname = "BoTHa";
int age = 17;
char gender = 'm';
double height = 148.9;
boolean married = true;
short treasures_found = 12;
byte shot = 4;
float bank_account = 8.1f;
long distance_traveled = 7834;
JOptionPane.showConfirmDialog(null,name);
}
public static void main(String args[])
{
new variables ();
}
} double ans = 0;
if (operation == "1")
{
ans = a*b;
JOptionPane.showMessageDialog(null, ans);
}
else if (operation == "2")
{
ans = a/b;
JOptionPane.showMessageDialog(null, ans);
}
else if (operation == "3")
{
ans = a-b;
JOptionPane.showMessageDialog(null, ans);
}
else if (operation == "4")
{
ans = a+b;
JOptionPane.showMessageDialog(null, ans);
}
else
{
ans = 0;
JOptionPane.showMessageDialog(null, ans);
}
//Your answer
JOptionPane.showConfirmDialog(null, "Number 1 = " +noa +"\nNumber 2 = " +nob +"\n" +noa +" x " +nob +"="+ans, "ANSWER", JOptionPane.PLAIN_MESSAGE, JOptionPane.INFORMATION_MESSAGE);//First digit
noa = JOptionPane.showInputDialog(null, "Enter your First value:", "Learning V2.1", JOptionPane.QUESTION_MESSAGE);
double a = Double.parseDouble(noa);
if (a != double)
{
noa = JOptionPane.showInputDialog(null, "Enter your First value:", "Learning V2.1", JOptionPane.QUESTION_MESSAGE);
}
else if (a == double)
{
JOptionPane.showConfirmDialog(null,"Your number = "+noa , "Learning V2.1", JOptionPane.PLAIN_MESSAGE, JOptionPane.PLAIN_MESSAGE);
}
else
{
noa = JOptionPane.showInputDialog(null, "Enter your First value:", "Learning V2.1", JOptionPane.QUESTION_MESSAGE);
}if (whateverNumber > maximum) {
ignore imput, go back to last JOptionPane
}
if (whateverNumber < minimum) {
ignore imput, go back to last JOptionPane
}try {
*input command*
} catch (inputMismatchError e) {
// comes here if input isn't a number)
go back to last JOptionPaneclass myClass {
private int currentAction;
private int oldValue;
private int newValue;
public static void main(String[] args) {
// will run this method first anyhow
this.currentAction = 0;
this.myMethod();
}
public void myMethod() {
this.oldValue = this.newValue;
if(this.currentAction == 0) {
boolean quit = false;
// do your first command here
// set this.currentAction to something else
// input value goes to newValue first, then you handle calculations
}
else if (this.currentAction == 1) {
// for example: adding two numbers together
}
else if(this.currentAction == *someothervalue*) {
}
else if(this.currentAction == *your last value*) {
// a panel pops up to ask if you really want to quit
// sets the boolean quit to true
}
// if quit is not true you don't execute this part of the code
if(!quit) {
this.myMethod();
// calls itself again, thus you will have an endless self-calling loop
// until you chose to end it with quit = true
}
}
}class someClass {
public static void main(String[] args) {
this.myMethod();
}
public void myMethod() {
// code that will be run over and over again
this.myMethod();
}
}class someClass2 {
private int aNum = 1;
public static void main(String[] args) {
this.myMethod();
}
public void myMethod() {
System.out.println(String.valueOf(this.aNum));
this.aNum++;
if(this.aNum < 50) {
this.myMethod();
}
}
}ls
cd Desktop
javac *.java
java someClass2 if (a != double)
{
noa = JOptionPane.showInputDialog(null, "Enter your First value:", "Learning V2.1", JOptionPane.QUESTION_MESSAGE);
}class mainClass {
public static void main(String[] args) {
someClass2 test = new someClass2(1);
}
}
class someClass2 {
private int aNum;
public someClass2(int i) {
this.aNum = i;
this.myMethod();
}
public void myMethod() {
System.out.println(String.valueOf(this.aNum));
this.aNum++;
if(this.aNum < 50) {
this.myMethod();
}
}
}try{
Double something = Double.doubleValue(input);
} catch(NumberFormatException e) {
// insert code to go back
}//operation
String operation = "";
operation = JOptionPane.showInputDialog(null, "enter the operation" + "\n 1=multiply" +"\n 2=divide" +"\n 3=subtract" +"\n 4=add", "Learning V2.1", JOptionPane.PLAIN_MESSAGE);try {
code
} catch(an error that might occur) {
//do something about it
// example to kill the application using System.exit(1)
}import java.io.*;
class inPut {
Object item;
private InputStreamReader isr = new InputStreamReader( System.in );
private BufferedReader stdin = new BufferedReader( isr );
private boolean debug;
private String lastLine;
private int lastInt = 0;
public inPut() {
this.debug = false;
}
public inPut(boolean d) {
this.debug = d;
}
/**
* reads the next line of text, if IO error it will run another set of this
*/
public String nextLine() {
try {
String input = stdin.readLine();
// if input isn't null or shorter than String.length = 1 returns string
if(input != null || input.length() > 0) {
this.lastLine = input;
return this.lastLine;
}
} catch(IOException e) {
// if debug is true and error is reached application tells why and dies
// otherwise business as usual (retries)
if (this.debug) {
System.out.println("IOException error");
System.exit(1);
}
this.nextLine();
}
// if
return null;
}
public int nextInt() {
try {
String input = stdin.readLine();
// if input isn't null or shorter than String.length = 1 returns string
if(input != null || input.length() > 0) {
this.lastInt = Integer.valueOf(input);
return this.lastInt;
}
} catch(IOException e) {
// if debug is true and error is reached application tells why and dies
// otherwise business as usual (retries)
if (this.debug) {
System.out.println("IOException error");
System.exit(1);
}
this.nextInt();
}
return 0;
}
// same as the two methods above, only prints out some text too before input is needed
public int nextInt(String str) {
System.out.println(str);
return this.nextInt();
}
public String nextString(String str) {
System.out.println(str);
return this.nextLine();
}
public int getLastInt() {
return this.lastInt;
}
public String getLastLine() {
return this.lastLine;
}
}inPut myInput = new inPut();inPut myInput = new inPut(boolean debug);int action = 1;
String command;
inPut myInput = new inPut(true)
// as long as action isn't 0 this will continue
while (action != 0) {
if (action == 1)
// this is where you define the first num
int temp = myInput.nextInt("a number please: ");
// who cares what temp does, we have it all in the myInput.getLastIn()
// but we go to next step:
action = 2;
}
if (action == 2) {
String command = myInput.nextLine("what do you want to do? + - / * quit");
action = 3;
continue;
}
if (action == 3) {
switch(command) {
case "+":
System.out.println(String.valueOf(myInput.getLastInt() + myInput.getInt("and last num please")));
break;
// continue here;
case "quit":
// ser wishes to quit - application dies
action = 0;
break;
default:
// if neither command was inserted, return to 2
action = 2;
}
}
}
Didn't want to interrupt the flow of conversation, but the Dummies series is really lacking in anything useful. If you're looking for a good introduction to Java, i suggest a book like Thinking in Java by Bruce Eckel, which is VERY well written and easy to understand.larswik said:
int someVariable;
someVariable = 1;int someVariable = 1;JOptionPane.showConfirmDialog(null,someVariable);