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package Reflects; import java.lang.reflect.Constructor; import java.lang.reflect.Field; import java.lang.reflect.InvocationTargetException; import jav 阅读全文
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package Reflects; import java.lang.reflect.Constructor; import java.lang.reflect.Field; import java.lang.reflect.InvocationTargetException; /** * 通过反射 阅读全文
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package Reflects; public class ReflectDemo{ public static void main(String[] args) throws ClassNotFoundException { Class<Actor> ac1 = Actor.class; Sys 阅读全文
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package Streams; import java.util.ArrayList; /** * 需求,按照下面的要求完成集合的创建和遍历 * 创建一个集合存储多个字符串元素 * 把集合中所有以张开头的元素存储到一个新的集合 * 把:张 开头的集合中长度为3⃣️的元素存储到一个新的集合 * 遍历 阅读全文
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package com; import java.util.function.Function; public class FuctionDemo { public static void main(String[] args) { convert("100",s -> Integer.parseI 阅读全文
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package com.runnable; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; public class ComparatorDemo { public stat 阅读全文
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package com.interfaces; public class Demo3 { public static void main(String[] args) { test((name, age) -> new Student(name,age)); test(Student::new); 阅读全文
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package com.interfaces; public class PrinterDemo { public static void main(String[] args) { usePrinter((String s)->{ System.out.println(s.toUpperCase( 阅读全文
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package com.interfaces; public class Demo2 { public static void main(String[] args) { start(s-> Integer.parseInt(s)); //引用类方法 start( Integer::parseInt 阅读全文
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package com.interfaces; public interface Inter { void show(); default void method(){ System.out.println("默认方法"); } public static void test(){ System.o 阅读全文
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package com.interfaces; public interface InterfaceOne { void aa(); void bb(); default void cc(){ } } 默认方法不是抽象方法,所以不被强制重写,但可以被重写,重写时候要去掉default关键字 publ 阅读全文
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package lambda; public interface Addable { int add(int x,int y); } package lambda; public class AddableDemo { public static void main(String[] args) { 阅读全文
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package Inter; import java.io.*; import java.net.ServerSocket; import java.net.Socket; public class ServeDemo { public static void main(String[] args) 阅读全文
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package Inter; import java.io.*; import java.net.Socket; public class ClientDemo { public static void main(String[] args) throws IOException { Socket 阅读全文
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package Inter; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.DatagramPacket; import jav 阅读全文
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package Inter; import java.io.IOException; import java.net.*; public class InetAddressDemo { public static void main(String[] args) throws IOException 阅读全文
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package Multithreading; import java.util.*; public class BuyTicketDemo { public static void main(String[] args) { StringBuffer sb = new StringBuffer() 阅读全文
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package Multithreading; /* 出现数据安全的原因 1。是否是多线程环境 2。是否是共享数据 3。是否有多条语句操作共享数据(打破此条件) 同步代码块的好处和弊端 好处:解决了多线程的数据安全问题 弊端:当线程很多时,因为每个线程都会去判断同步上的锁,这里很耗资源的,无形中会降 阅读全文
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package Multithreading; public class MyRunnableDemo { public static void main(String[] args) { MyRunnable myRunnable = new MyRunnable(); Thread thread 阅读全文
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package Multithreading; public class MyThreadDemo { public static void main(String[] args) { MyThread my1 = new MyThread("飞机"); MyThread my2 = new MyT 阅读全文
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package Iodemo; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import java.ut 阅读全文
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package Iodemo; import java.io.*; public class ObjectInputStreamDemo { public static void main(String[] args) throws IOException, ClassNotFoundExcepti 阅读全文
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package Iodemo; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectOutput; import java.io.ObjectOutputStream; public cl 阅读全文
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package Iodemo; import java.io.*; public class CopyAllDemo { public static void main(String[] args) throws IOException { File f = new File("/Volumes/m 阅读全文
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package Iodemo; import java.io.*; /** * 复制单级目录 */ public class CopyOneDir { public static void main(String[] args) throws IOException { File srcFolder 阅读全文
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import java.util.Comparator; import java.util.TreeSet; public class orderDemo { public static void main(String[] args) { TreeSet<Student> s = new Tree 阅读全文
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JAVA 字符流读取和写入改进 ,用到读写便捷类 import java.io.*; public class CopyJavaDemo { public static void main(String[] args) throws IOException { File file = new Fil 阅读全文
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import java.io.*; public class CopyJavaDemo { public static void main(String[] args) throws IOException { File file = new File("./src/CopyJavaDemo.jav 阅读全文
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import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStreamReader; public class Input 阅读全文
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import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStreamWriter; /* void write (i 阅读全文