//查询创建了多少对象
public class Test{
public static void main( String args[]){
Test a= new Test();
a.OutputInformation();
Test b= new Test();
b.OutputInformation();
Test c= new Test();
c.OutputInformation();
Test d= new Test();
d.OutputInformation();
}
static int num=0;
public Test(){
num++;
}
public void OutputInformation(){
System.out.println("已经创建了"+num+"个对象！");
}
}
截图
