Java 这段代码为什么会导致jvm抛出OutOfMemoryError

Question

public class Test{
public static void main(String[] args)throws Exception{
try{
Object[] o = null;
while (true) {
o = new Object[] { o };
}
}catch(OutOfMemoryError e){
System.out.println("out of memory");
}
}
}
以上这段代码运行一会儿会抛error
public class Test{
public static void main(String[] args)throws Exception{
try{
Object[] o = null;
while (true) {
//o = new Object[] { o };
o = new Object[1];
o[0] = o;
}
}catch(OutOfMemoryError e){
System.out.println("out of memory");
}
}
}
下面这段却不会抛出error

Answer 1

o = new Object[] { o }; 放的是堆内存的数据。申请额外的内存空间
o = new Object[1];o[0] = o;直接是赋值。没有申请额外的内存空间