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java基础知识总结带目录版.pdf
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java基础知识总结带目录版.pdf
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1 / 66
Java ( )
1
2 1,2,3
3
4 java
1
2 ( )
3 demo
4 test
java ................................................................................................................................................... 3
1JDKJava Development Kit .................................................................................................................. 3
2JREJava Runtime Environment ........................................................................................................... 3
3 ...................................................................................................................................... 3
4javac java ................................................................................................. 3
java ........................................................................................................................................ 3
1 ................................................................................................................................................. 3
2 ................................................................................................................................................. 4
3 .................................................................................................................................................... 4
4 .................................................................................................................................................... 4
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: ............................................................................................................................ 4
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Java ................................................................................................................................. 10
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final ............................................................................................................................................. 13
: abstract .............................................................................................................................................. 13
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1 ........................................................................................................................................... 16
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< java.util.concurrent.locks > Condition await() signal() signalAll() .................... 28
--< java.lang >-- StringBuffer .................................................................................... 31
--< java.lang >-- StringBuilder ................................................................................... 32
Integer ................................................................................................................................ 33
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Map .................................................................................................................................................... 39
IO ..................................................................................................................................... 48
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File ........................................................................................................................................................ 53
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RandomAccessFile: ......................................................................................................................................... 58
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-----------------------------------------------------------------------------------------------
java
1991 Sun James Gosling Oak
PDA
1994 Oak Java
Java :
JAVAEEJava Platform Enterprise Edition web
JAVASEJava Platform Standard Edition
JAVAMEJava Platform Micro Edition
1JDKJava Development Kit java java jre
2JREJava Runtime Environment java java +JVM(java )
3 java jdk\bin
1 JAVA_HOME=% %\Java\jdk
path=%JAVA_HOME%\bin
2 set path=%path%;C:\Program Files\Java\jdk\bin
path
classpath :
1 classpath=.;c:\;e:\
2 set classpath=.;c:\;e:\
classpath
classpath java jvm
classpath
1 classpath
2 classpath
4javac java
java
javac javac java .java
jvm class java
java . jvm. , class .
, , main .
----------------------------------------------------------------------------------------------
java
1
4 / 66
2 0-9 a-z $_
1
2
3
4
1
2
3
:
1 byte short int long float double char boolean
2 :
byte,char,short( )-->int-->float-->long-->double
?
1
+ - * / % %: 2 0 1
+:
++,--
2
= += -= *= /= %=
3
true false
4
& | ^ ! && ||
! boolean
&: true true false
|: false false true
^:
false
true.
& && &
5 / 66
&&: false
| || |
|| true
5 :
& | ^
<< >> >>>( )
int a = 3,b = 5;-->b = 3,a = 5;
a = a + b; a = 8;
b = a - b; b = 3;
a = a - b; a = 5;
a = a ^ b;//
b = a ^ b;//b = a ^ b ^ b = a
a = a ^ b;//a = a ^ b ^ a = b;
2*8 = 2<<3;
5
If switch do while while for
1 if switch
switch
switch( ){
case : ;break;
,
default: ;
}
case case
case default
1break break
2 switch byte,char,short,int
3 default switch default expression
case value default break
2 boolean if
3
while for
for for
break: switch
break break
continue:
6 java
java
( 1 1 ){
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