1、基本數據類型
TYPE | size | range | default value |
---|---|---|---|
byte | 1Byte | -128-127 | 0 |
short | 2Byte | -32768-32767 | 0 |
int | 4Byte | -2,147,483,643-2147483642 | 0 |
long | 8Byte | -2^8~2^8-1 | 0L |
float | 4Byte | -3.203E38~3.403E38 | 0.0f |
double | 8Byte | -1.798E308~1.798E308 | 0.0d |
char | 2byte | '\u0000' | |
boolean | 1Byte | false |
2、switch-case 語句
public void testSwitchCase(){
char lab='c';
switch ( c){
case 'a': System.Out.print("a") ;break;
case 'c' : System.Out.print("c") ;break;
case 'b' : System.Out.print("b") ;break;
default : System.Out.print("No") ;
}
}