?? ??? ??? ????.
(?? ?? ?? : java ?? ??)
???(Byte)? IO ??? ?? ??? ????, ??? ???? ?????? ???? OutputStream ???? ???? ??? ??? ? ????
? ???? ??? ?? ?????.
public?abstract?class?OutputStream
extends?Object
implements?Cloneable?Flushable{}
OutputStream ????? Closeable Flushable ? ?? ?? ?????? ?????.
? ? ?????? ??? ??? ????
public?interface?Cloneable
extends?AutoCloseable{
public?void?close()?throws?IOException;
}
public?interface?Flushable{
public?void?flush()?throws?IOException;
}
OutputStream? ?? ???? ????? ?? ??? ?? ??? ????? ?? ?????? ?? ?? ???? ???? ???. ????? ?? ?? ??? ???? ?? ?? FileOutputStream ?? ???
? ??? ? ????. ?? ???? ?? ??
/**
?*?字符流寫功能
?*?@throws?IOException?
?*/
public?static?void?demo4()?throws?IOException?{
Writer?writer?=?new?FileWriter("J:/demo2.txt",true);
writer.write(123);
writer.write("一二三");
writer.write(879);
writer.flush();
writer.close();
}
/**
?*?字符流讀功能
?*?@throws?IOException?
?*/
public?static?void?demo5()?throws?IOException?{
Reader?reader?=?new?FileReader("J:/demo2.txt");
System.out.println((char)reader.read());
System.out.println((char)reader.read());
int?a?=?0;
while((a=reader.read())?!=?-1)?{
System.out.println((char)reader.read());
}
reader.close();
}
??? ???? ?? Content
/**
?*?創(chuàng)建文件并寫入內(nèi)容
?*?
?*?@throws?IOException
?*/
public?static?void?demo1()?throws?IOException?{
File?file?=?new?File("J:/demo.txt");?//?創(chuàng)建這個(gè)文件
OutputStream?os?=?new?FileOutputStream(file,?true);?//?創(chuàng)建流對象?最后加個(gè)true參數(shù)代表是續(xù)寫不是重寫,不寫true的話下一次運(yùn)行這個(gè)方法就是清空內(nèi)容并且重寫
os.write(10);//?添加內(nèi)容
os.write(302);//?添加內(nèi)容
os.write(11);//?添加內(nèi)容
os.write("hello?world".getBytes());?//?上面是添加數(shù)字類型,?這一行代表添加字符
os.close();?//?關(guān)閉流
}
? ?? ?? ???? ?? ? ???? ?? ???? ??(??? ??? ??? ? ???)? ????? ????. ??? ???? ??? ?? ??? ???? ?????.
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settings.json ??? ??? ?? ?? ?? ?? ?? ??? ??? VSCODE ??? ??? ???? ? ?????. 1. ??? ?? ?? : Windows? C : \ Users \\ AppData \ Roaming \ Code \ User \ Settings.json, MacOS IS /users//library/applicationsupport/code/user/settings.json, linux? /home//.config/code/user/settings.json; 2. Workspace ?? ?? : .vscode/settings project root ????
JDBC? Java? ??? ???? ??? ??????
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JDBC ????? ???? ????? ?? ?? ?? ??? ?? ?? ??? ?? ? ?? ??? ?? ?? ?? ??? ???????. 1. ????? ????? Conn.SetAutoCommit (False)?? ??????. 2. ??? ? ????? ?? ?? SQL ??? ?????. 3. ?? ??? ??? ?? Conn.commit ()?? ???? ??? ???? ???? ?? ??? ???? Conn.Rollback ()?? ??????. ???, ? ??? ???? ????, ??? ???? ????, ?? ??? ??? ?? ??? ??? ???? ? ???????. ?? ?? ?? ???? ????? ??? ???? ?? ?? ???? ???? ??? ????? ?? ??? ??? ? ?? ???? ?? ????.
???? ??? ?? Java? ??? ?? ??? ?
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??? (DI) ISADESIGNPATTORNWHEREWHEDROUDIVESTESTESTETESTERGROWCONSTRUCTOR, 2.SPRINGFRAMEWWERTHUSENONTATIONS? ??@autowiredWithjava ?? CONCUTTATIONS LIKERWITHCONSTRUCTOR, ORFIELDINGESS.2.SPRINGFRAMEWWERTHUSENNOTATIONS
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?? ?? ? ?? ???? ???? ?? Java.Time ???? ???? ??????. 2. LocalDate, LocalDateTime ? LocalTime? ?? ?? ??? ??? ?????. 3. () ???? ???? ?? ??? ??? ????. 4. ???/???? ??? ???? ??? ????? ??? ??????. 5. ZonedDateTime ? Zoneid? ???? ???? ??????. 6. DateTimeFormatter? ?? ?? ? ?? ?? ?? ???; 7. ??? ?? ?? ?? ??? ????? ?? ??????. ?? Java? ?? ??? ???? ??? ??? ???? Java.Timeapi ??? ?? ??? ???????.
JVM (Java Virtual Machine) ?? ??
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thejvmenablesjava? "WriteOnce, Runynywhere"??? ?? excodecodethroughfourmaincomponents : 1. theclassloadersubsystemloads, ??, ? intinitializes.classfilesusingbootsprap, extension, andapplicationclassloaders, ensuringsecureandlazyclasloa
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Pre-FormancetArtUptimeMoryUsage, Quarkusandmicronautleadduetocompile-timeprocessingandgraalvsupport, withquarkusoftenperforminglightbetterine serverless sinarios.2.thyvelopecosyste,
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