1.
public class test1 {public static void main(String[] args) {
Person P = new Person("gdsgds");
System.out.println(P.name);//输出为null
}
}
class Person{
String name;
int age;
public Person(){
}
public Person(String name){
}
}
2.class SDText{
static SDText sd =new SDText(); 加载静态区 第一句 第二句 第三句
static int x=3; sd null 0x001 0x001 0x001
static int y; x 0 1 3 3
public SDText(){ y 0 1 1 1
x++;
y++;
}
}//输出x=3 y=1
3.
class SDText{
SDText sd =new SDText();
int x=3;
int y;
public SDText(){
x++;
y++;
}//StackOverflowError