日常笔记1(仅供个人参考)
作者:互联网
JAVA(需记)
1、JDK7(8也行)新特性:数字之间可以用下划线分割且不会输出下划线
例
public class Day01 {
public static void main(String[]args){
int a = 10_0000_0000;
System.out.println(a);
}
}
2、实例变量:从属于对象
数据类型 | 默认值 |
---|---|
byte | 0 |
shout | 0 |
int | 0 |
long | 0L |
float | 0.0f |
double | 0.0d |
char | 'u0000' |
String | null |
boolean | flase |
实例
public class Day01 {
static byte by;
static short sh;
static int i;
static long l;
static float f;
static double d;
static char ch;
static String str;
static boolean bool;
public static void main(String[]args){
System.out.println("Byte:"+by);
System.out.println("Short:"+sh);
System.out.println("Integer:"+i);
System.out.println("Long:"+l);
System.out.println("Float"+f);
System.out.println("Double:"+d);
System.out.println("Character:"+ch);
System.out.println("String:"+str);
System.out.println("Bool:"+bool);
}
}
实例输出结果:
Byte: | 0 |
---|---|
Short: | 0 |
Integer: | 0 |
Long: | 0 |
Float: | 0.0 |
Double: | 0.0 |
Character: | |
String: | null |
Bool: | false |
标签:String,参考,0.0,System,笔记,static,仅供,println,out 来源: https://www.cnblogs.com/jiabaolu/p/14732989.html