Shulou(Shulou.com)06/03 Report--

Notes section:

Create threading mode

-

1.Thread

2.Runnable {public void run ();}

Class Man extends Person implements Runnable {

Public void run () {

...

}

}

New Car () .start ()

New Thread (new Man (). Start ()

Eclipse

-

Alt + / Code assist

Alt + up Arrow / / move up one line

Alt + Down Arrow / / move up one line

Alt + shift + Arrow up / / copy one line up

Alt + shift + Down Arrow / / copy one line down

Ctrl + D _ paw / delete a row

String

-

1. Determine whether it is the same object. Determine the memory address of the object.

2. Equals / / is to determine whether the contents of two objects are the same.

Split (String reg); / / splits according to the specified string and returns an array of values.

Substring (int start); / / fetch substring operation to specify all characters after the starting index

Substring (int start,int end); / / fetch substring operation, specifying all characters between the start index and the end index

/ / contains the starting index, but not the ending index. (a) belongs to the half-open and half-closed interval.

ByteByte / / wrapper class

ShortShort

IntInteger

LongLong

FloatFloat

DouleDouble

BooleanBoolean

CharCharacter

Byte b = 127,

Byte b = new Byte

StringBuffer

String buffer

StringBuffer is a string variable, and its objects can be extended and modified.

The append method can append strings, characters, objects, etc.

Compared with String: when the String method executes Sting=String+i and so on, the String object is actually an immutable object, so it is constantly creating objects and increasing them in the string pool. The original object is reclaimed, and the String execution efficiency is low.

The methods in StringBuffer are modified by synchronized, are synchronous and thread-safe, only one object can be executed at a time, and the lock is the current StringBuffer object at the time of execution.

StringBuilder is not modified by synchronized, asynchronous

The performance is inconsistent. StringBuilder does not need to judge whether the object lock is occupied or not during each visit. The performance is better and the efficiency is higher.

Assignment section:

1. According to the production and consumption relationship between bees and bears, bears eat 10 jin of honey. Bees produce one jin of honey at a time, and it takes 10 seconds for bees to produce one jin of honey.

Ten bees and two bears.

Code:

Package com.work.ten;class Bear extends Thread {private FengMi fengmi; private String bearname; public Bear (FengMi fengmi,String bearname) {this.fengmi=fengmi; this.bearname=bearname } public void run () {while (true) {synchronized (fengmi) {if (fengmi.getFengmiWeight () = 10&&fengmi.getFengmiWeight () = 0) { Fengmi.ChiFemgmi () System.out.println ("10 jin of honey is eaten by" + bearname+ ", surplus" + fengmi.getFengmiWeight () + jin of honey "); try {fengmi.notifyAll () } catch (Exception e) {} }} yield () Class FengMi {private static int fengmiWeight=0; / / Honey in Honeypot private final int fengmiWeightMax=20; / / the upper limit of honey in honeypot public int getFengmiWeight () {return fengmiWeight;} public int getFengmiWeightMax () {return fengmiWeightMax } public void CreateFemgmi () {/ / produce honey this.fengmiWeight + = 1;} public void ChiFemgmi () {/ / eat honey this.fengmiWeight-= 10;}} class Bee extends Thread {private FengMi fengmi; private String beename Public Bee (FengMi fengmi,String beename) {this.fengmi=fengmi; this.beename=beename;} public void run () {int iTunes 1 While (true) {synchronized (fengmi) {if (fengmi.getFengmiWeight ())

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.