UC知道一个静态变量的java小程序
来源：百度知道 编辑：UC知道 时间：2024/05/22 15:55:19
public class TestCount {
private int count1=0;
private static int count2=0;
public int getCount1(){
return count1;
}
public int getCount2(){
return count2;
}
public void add(){
count1++;
count2++;
}
public static void main(String[] args) {
TestCount t1=new TestCount();
TestCount t2=new TestCount();
TestCount t3=new TestCount();
t1.add();
System.out.println(t1.getCount1()+","+t1.getCount2());
t2.add();
System.out.println(t1.getCount1(+","+t1.getCount2());
System.out.println(t2.getCount1()+","+t2.getCount2());
}
}
为什么t1的值不变啊，请详细解释啊，新手
private int count1=0;
private static int count2=0;
public int getCount1(){
return count1;
}
public int getCount2(){
return count2;
}
public void add(){
count1++;
count2++;
}
public static void main(String[] args) {
TestCount t1=new TestCount();
TestCount t2=new TestCount();
TestCount t3=new TestCount();
t1.add();
System.out.println(t1.getCount1()+","+t1.getCount2());
t2.add();
System.out.println(t1.getCount1(+","+t1.getCount2());
System.out.println(t2.getCount1()+","+t2.getCount2());
}
}
为什么t1的值不变啊，请详细解释啊，新手
t1是对象，怎么变？
你是想说count1的值不变么？
t1.add();
System.out.println(t1.getCount1()+","+t1.getCount2());
实例t1的count1=1 ,count2=1
输出1，1
===================================================================
t2.add();
System.out.println(t1.getCount1(+","+t1.getCount2());
实例t1的count1=1,
实例t2的count1=1,由于count2是静态的，存放在静态存储区所以count2也要自加 ,count2=2.
输出1，2
===================================================================
System.out.println(t2.getCount1()+","+t2.getCount2());
直接输出实例t2的count1和count2
既输出 1，2
===================================================================
静态变量是存放在静态存储区的，
就只有1个，
没有打上static的变量，只要是不同的实例，内存就会开辟出不同的空间，互相没有关系