全部

问一个基本问题，static int i=10与int i=10有什么区别？

Ericsson 2002-03-21 03:00:26

谢谢了

...全文

1577 点赞收藏 12

写回复

12 条回复

切换为时间正序

当前发帖距今超过3年，不再开放新的回复

发表回复

一人前端 2002-03-22

static是静态变量的意思。使用该变量的类，可以不必实例化类。或许就这些吧！

回复赞

usxue 2002-03-21

static变量，就是在static的method中也是可以直接访问的！

回复赞

cxhz_cn 2002-03-21

调用static的变量不用初始化该变量的类

回复赞

陈一矛 2002-03-21

STATIC在整个CLASS中的值是始终保持不变的,和FINAL不一样.给你一个例子,执行一遍你就明白了

//: FinalData.java
// The effect of final on fields

class Value {
int i = 1;
}

public class FinalData {
// Can be compile-time constants
final int i1 = 9;
static final int I2 = 99;
// Typical public constant:
public static final int I3 = 39;
// Cannot be compile-time constants:
final int i4 = (int)(Math.random()*20);
static final int i5 = (int)(Math.random()*20);

Value v1 = new Value();
final Value v2 = new Value();
static final Value v3 = new Value();
//! final Value v4; // Pre-Java 1.1 Error:
// no initializer
// Arrays:
final int[] a = { 1, 2, 3, 4, 5, 6 };

public void print(String id) {
System.out.println(
id + ": " + "i4 = " + i4 +
", i5 = " + i5);
}
public static void main(String[] args) {
FinalData fd1 = new FinalData();
//! fd1.i1++; // Error: can't change value
fd1.v2.i++; // Object isn't constant!
fd1.v1 = new Value(); // OK -- not final
for(int i = 0; i < fd1.a.length; i++)
fd1.a[i]++; // Object isn't constant!
//! fd1.v2 = new Value(); // Error: Can't
//! fd1.v3 = new Value(); // change handle
//! fd1.a = new int[3];

fd1.print("fd1");
System.out.println("Creating new FinalData");
FinalData fd2 = new FinalData();
fd1.print("fd1");
fd2.print("fd2");
}
} ///:~

回复赞

earnest 2002-03-21

static is class variable,all the object of the class using the variable,any object of the class can change the variable.it not only can be using by the object but also can be using by the class.

回复赞