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How to declare string replace in java - Computers & Internet

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Look it up: http://mindprod.com/jgloss/string.html#REPLACE
http://www.scribd.com/doc/2955696/java-cheat-sheet

list of others: http://techcheatsheets.com/tag/java/

Posted on Feb 05, 2009

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1 Answer

Write a pseudocode declaration for a string array initialized with the following strings einstein newton


the nice thing about pseudocode is that there's many ways to do it
E.g 1;
String str = new Array["einstein',"newton"];
E.g 2;
myStringArray = new Array{'einstein','newton'}

BOTH of the above are correct, because they are pseudocode

Oct 19, 2014 | Computers & Internet

1 Answer

How can I format a java string using a width variable?


The Entities in java are slightly different. I adore them being included (finally).

float bigNum = 123456.789012;

String pattern = String.format( "%10.2f is my magic number%n", bigNum);

System.out.println( pattern);

or

System.out.println(

String.format( "%10.3f", bigNum) );

the "decimal place" is the rounding.

lead off with a zero to get leading zeroes

String.format("%03.2f", bigNum));

if I want evenly spaced columns, I have to construct an Object[] array

array[0] = salaryAmt;

array[1] = hourly Rate;

array[2] = "Cowboy Bob";

System.out.println(

"%5.2f,%3.2d,%s%n, array);

Here you will get more information about java string format.

Nov 21, 2012 | Jeep Cars & Trucks

2 Answers

What is strings in java?


Handling character strings in Java is supported through two final
classes: Java String and StringBuffer. The String class implements immutable character strings, which are read-only once the string has been created and initialized, whereas the StringBuffer class implements dynamic character strings. All string literals in Java programs, are implemented as instances of String class. Strings in Java are 16-bit Unicode.

Nov 21, 2012 | Sun Java Programming Language (cdj-275)

4 Answers

Java is not working


Hello there :
first you are going to want to ensure that your your current version of java is installed correctly and is not corrupted and if it needs to be reinstalled
download the latest java version and reinstall this . www.java.com
this should be able to take care of the problem that you are having ok?
best regards michael

Aug 23, 2009 | ArcMedia JavaScript Source Code 3000 Pro...

1 Answer

I want to read text file which is located in c drive using java code can anybody help me out


import java.io.*;
import java.util.Scanner;

public final class ReadWithScanner { public static void main(String... aArgs) throws FileNotFoundException {
ReadWithScanner parser = new ReadWithScanner("C:\\Temp\\test.txt");
parser.processLineByLine();
log("Done.");
}

/**
* @param aFileName full name of an existing, readable file.
*/

public ReadWithScanner(String aFileName){
fFile = new File(aFileName);
}

/** Template method that calls {@link #processLine(String)}. */
public final void processLineByLine() throws FileNotFoundException {
Scanner scanner = new Scanner(fFile);
try {
//first use a Scanner to get each line
while ( scanner.hasNextLine() ){
processLine( scanner.nextLine() );
}
}
finally {
//ensure the underlying stream is always closed
scanner.close();
}
}

/**
* Overridable method for processing lines in different ways.
*
* <P>This simple default implementation expects simple name-value pairs, separated by an
* '=' sign. Examples of valid input :
* <tt>height = 167cm</tt>
* <tt>mass = 65kg</tt>
* <tt>disposition = "grumpy"</tt>
* <tt>this is the name = this is the value</tt>
*/

protected void processLine(String aLine){
//use a second Scanner to parse the content of each line
Scanner scanner = new Scanner(aLine);
scanner.useDelimiter("=");
if ( scanner.hasNext() ){
String name = scanner.next();
String value = scanner.next();
log("Name is : " + quote(name.trim()) + ", and Value is : " + quote(value.trim()) );
}
else {
log("Empty or invalid line. Unable to process.");
}
//(no need for finally here, since String is source)
scanner.close();
}

// PRIVATE //
private final File fFile;

private static void log(Object aObject){
System.out.println(String.valueOf(aObject));
}

private String quote(String aText){
String QUOTE = "'";
return QUOTE + aText + QUOTE;
}
}

Jun 22, 2009 | Sun Java Programming Language (cdj-275)

1 Answer

How to declare and initialize variables in java


well there is not much difference there.the difference is in the data types not in declaration

Jun 04, 2009 | Computers & Internet

1 Answer

Code for method parseInt() in java


parseInt(java.lang.String, int)

This code takes two arguments, a string constructor from the Java language and an integer. Its purpose is to parse (meaning de-construct or disassemble into component parts) one data type into another.

Here is an example of a Java program to specify and print out the dimensions of a rectangle, taken from the page http://www.roseindia.net/java/beginners/entervaluesfromkeyboard.shtml:

class Rectangle{
int length, breadth;
void show(int x, int y){
length = x;
breadth = y;
}
int calculate(){
return(length * breadth);
}
}
public class EnterValuesFromKeyboard{
public static void main(String[] args) {
Rectangle rectangle = new Rectangle();
int a = Integer.parseInt(args[0]);
int b = Integer.parseInt(args[1]);
rectangle.show(a, b);
System.out.println(" you have entered these values : " + a + " and " + b);
int area = rectangle.calculate();
System.out.println(" area of a rectange is : " + area);
}
}

Apr 09, 2009 | Sun Java Programming Language (cdj-275)

1 Answer

Table creation via textfields using swings


import java.lang.Object;
import javax.swing.table.DefaultTableModel;


public class tabletest extends javax.swing.JFrame {
String[][] row = null;
String[] title=new String[3];
private int i;


/** Creates new form tabletest */
public tabletest() {
initComponents();
setTitle("table test");
setVisible(true);
System.out.print("NO Database Needed");
title[0]="Name";
title[1]="Desig";
title[2]="id";
}


/*
" In middle of this two source one generated code will be there that will be done by dragging ur fields to ur frame. THIS IS FOR netbeans IDE "
*/

private void b1ActionPerformed(java.awt.event.ActionEvent evt) {
row=new String[4][3];
// TODO add your handling code here:

String s1=t1.getText();
System.out.println(" event 1");
String s2=t2.getText();
System.out.println(" event 2");
int k=Integer.parseInt(t3.getText());
String s3=""+k;
System.out.println(" event 3");
try{
// for(int i=0;i<=2;i++)
row[i][0]=s1;
row[i][1]=s2;
row[i][2]=s3;
i++;

}catch(Exception e){
e.printStackTrace();

}
table.setModel(new DefaultTableModel(row,title));
}

private void b2ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:

t1.setText("");
t2.setText("");
t3.setText("");

}

/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new tabletest().setVisible(true);
}
});
}

// Variables declaration - do not modify
private javax.swing.JButton b1;
private javax.swing.JButton b2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JPanel jPanel1;
private javax.swing.JLabel l1;
private javax.swing.JLabel l2;
private javax.swing.JLabel l3;
private javax.swing.JPanel p2;
private javax.swing.JScrollPane scp1;
private javax.swing.JTextField t1;
private javax.swing.JTextField t2;
private javax.swing.JTextField t3;
private javax.swing.JTable table;
// End of variables declaration

}

Mar 13, 2009 | Computers & Internet

1 Answer

Please explain the working of this code


It's a Java http server (webserver) that serves random "prices" if they match a search string.

Well here is an explaination:

private static String[] symbols = {"DELL", "INTC", "MSFT", "ORCL", "SUNW"};
These are search strings

private static Random rnd = new Random();
This generates a random number

private static Charset cs = Charset.forName("UTF-8");
This is the charset that the http server uses

ServerSocketChannel server = ServerSocketChannel.open();
Create a new server

server.socket().bind(new InetSocketAddress(8055));
Bind the http server to port 8055

The rest is handling the request and processing it

But here:
if(Arrays.binarySearch(symbols, symbol) >= 0)
response = "Price is " + (1000 + rnd.nextInt(9000)) / 100.0;
else
response = "Price not available";
channel.write(cs.encode("HTTP/1.0 200 OK "));
channel.write(cs.encode("Content-type: text/plain "));
channel.write(cs.encode(response));
channel.close();
}
It sees if the string input matchs: DELL INTC MSFT ORCL SUNW.

(private static String[] symbols = {"DELL", "INTC", "MSFT", "ORCL", "SUNW"};)
If so, it gives a price based on a random number.
(
response = "Price is " + (1000 + rnd.nextInt(9000)) / 100.0;)
Or else
It says "price not available"
then it gives a html header to end the error message.

Hope I helped you :)
Gook luck

Nov 26, 2008 | Computers & Internet

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