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Java tutorial

Use the command line to use the java multi-threaded downloader that supports breakpoint resume downloading

Copy the code as follows: package org.load.download;import java.io.File;import java.io.IOException;import java.io.InputStream;import java

2025-01-12
4 ways to use java singleton mode to share

1. The List copy code of Java Concurrency In Practice is as follows: public class Singleton { private static class SingletonHolder { public stati

2025-01-12
Sharing several implementation methods of thread-safe singleton mode

1. The Hungry-style singleton copy code is as follows: public class Singleton {private final static Singleton INSTANCE = new Singleton();private Singleton() {

2025-01-12
Java Observer Pattern Implementation and Java Observer Pattern Evolution

The simple observer pattern implementation copy code is as follows: import java.util.ArrayList;import java.util.Collections;import java.util.Iterator;import java.util.Li

2025-01-12
Example sharing of short-process job scheduling for operating systems implemented in Java

Copy the code as follows: package com;import java.util.Arrays;public class sjf {public static void main(String[] args) {sjf SJF=new sjf()

2025-01-12
Java uses smslib to connect to SMS modem to send SMS code sharing

Copy the code as follows: import java.util.ArrayList; import java.util.List; import org.apache.log4j.Logger; import org.smslib.ICallNotifica

2025-01-12
Example of java reading excel files and copying the files to the specified directory

Copy the code as follows: import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutpu

2025-01-12
Java uses des encryption and decryption example sharing

Copy the code as follows: import java.security.Key; import java.security.SecureRandom; import java.security.spec.AlgorithmParameterSpec; imp

2025-01-12
Java uses httpclient to send post request example

Copy the code as follows: package org.ssi.util;import java.io.IOException;import java.util.ArrayList;import java.util.List;import net.sf.

2025-01-12
Example of catching sub-thread exceptions in java multi-thread programming

Sub-thread exceptions cannot be caught through try catch. The Thread object provides the setUncaughtExceptionHandler(Thread.UncaughtExceptionHandler eh) method to obtain exceptions generated in the thread. Copy the code code as follows

2025-01-12
Java design pattern implementation of object pool pattern example sharing

The ObjectPool abstract parent class copy code is as follows: import java.util.Iterator; import java.util.Vector; public abstract class ObjectPool<T> {private V

2025-01-12
Java uses selection sort method to sort array implementation code

Write a program to convert the input string into a one-dimensional array and sort the array using selection sort. The idea is as follows: click the "Generate Random Number" button to create a Random random number object; use the setText() method

2025-01-12
How to use Java to randomly select lucky viewers from an array

Write a program to input the names of all the viewers into the array in advance, then obtain the total number of array elements, and finally randomly extract the subscripts of the elements from the array elements, and obtain the names of the lucky viewers

2025-01-12
Java implementation method of obtaining the minimum value of a one-dimensional array

Write a program to accept a single line of data entered by the user in the text box. These data are all integer numbers, separated by spaces, and the number of spaces is not limited. And split the data into a one-dimensional array, and then extract the mi

2025-01-12
Array sorting methods in Java (quick sort, bubble sort, selection sort)

1. Use sort() in the Arrays class in the JavaApi document for quick sorting. Copy the code as follows: import java.util.Arrays; public class TestOne{public static void main(String

2025-01-12

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