Eagle

File file = new File("u://"); int count = countFilesInDirectory(file); ilesInDirectory(file);  System.out.println("count" + count); public static  int  countFilesInDirectory ( File directory ) {        int  count =  0 ;        for  ( File file : directory.listFiles ()) {            if  ( file.isFile ()) {                count++;            }            if  ( file.isDirectory ()) {                count += countFilesInDirectory ( file ) ;            }      ...

class PreTesting {     static void doSomething()     {         System.out.println("Method in parent class");     } } public class Testing extends PreTesting {     static void doSomething()     {             System.out.println("Method in child  class");     }     public static void main(String args[]) throws Exception {       PreTesting preTesting =  new Testing();       preTesting.doSomething();   } } //outout is : Method in parent class

import org.apache.commons.lang.StringUtils; public class Testing {   public static void main(String[] args) { String words = "I am walking"; System.out.println("Letter Reverse : " + StringUtils.reverse(words)); System.out.println("Words Reverse " + StringUtils.reverseDelimited(words, ' ')); } }

//Integer to String String a = String.valueOf(2);   //String to integer int i = Integer.parseInt(a); n

jar uf c:\ CodeReview .jar com\pmd\rules\ NameRule .class

List list = Arrays.asList(array);

Tomcat on Windows (started manually) If you run Tomcat (eg. from JIRA Standalone) on Windows, and are starting it manually by running bin\startup.bat, edit bin\setenv.bat and add the line: setenv.bat set JAVA_OPTS =-Xms256m -Xmx256m and then restart. Adjust 256 to the maximum memory you want to allocate. If bin\setenv.bat does not exist, create it.

import org.apache.commons.lang.time. StopWatch ; StopWatch clock = new StopWatch (); clock.start(); for( int i = 0; i < 100000000; i++ ) { Math.sin( 0.34 ); } clock.stop(); System.out.println( "It took" + clock.getTime() + " milliseconds" );

Following are some performance tips in Java. We know many of them still do not use them in regular practice. Compile-Time Initialization for (int i =0; i < loop; i++) { //Looping 10M rounds String x = "Hello" + "," +" "+ "World"; } Better way is.... for (int i =0; i < loop; i++) { //Looping 10M rounds String x = new String("Hello" + "," +" "+ "World"); } ------------------------------------------------------------------------------------------------------------------- Runtime String Initialization String name = "Smith"; for (int i =0; i < loop; i++) { //Looping 1M rounds String x = "Hello"; x += ","; x += " Mr."; x += name; } Better way is.... String name = "Smith"; for (int i =0; i < loop; i++) { //Looping 1M rounds String x = (new StringBuffer()).append("Hello").append(",").append(" ").append(name).toString(...