小编ddf*_*fal的帖子

public class Demo {  

    public static void main(String[] args) {

        String s1 = "Hello";
        String s2 = "Hello";
        System.out.println("s1 == s2 " + (s1 == s2));

        String s5 = "Hel" + "lo";
        String s6 = "He" + "llo";
        System.out.println("s5 == s6 " + (s5 == s6));

        String s7 = "He";
        String s8 = "Hello";
        s7 = s7.concat("llo");
        System.out.println("s7 == s8 " + (s7 == s8));

        String s10 = "He";
        s10 = s10 + "llo";
        System.out.println("s1 == s10 "+(s1 == s10)); …

嗨,我在java中初始化有问题,下面的代码给我编译错误:expected instanceInt = 100; 但我已经宣布了.如果这些东西与堆栈和堆的东西有关,请用简单的术语解释,我是java的新手,我对这些领域没有高级知识

public class Init { 

int instanceInt;  
instanceInt = 100;

   public static void main(String[] args) {

     int localInt;
     u = 9000;
     }

}  

嗨任何人可以请解释我为什么是这样的代码片段给我的StackOverflowError我很感激,如果你能解释发生了什么事时,instanceObj初始化和调用构造函数ObjectTest和java.lang.Object继承构造函数.在我看来ObjectTest构造函数循环一遍又一遍.但我不知道确切的原因？所以任何建议......

public class ObjectTest {

  public ObjectTest() {

   }


  ObjectTest instanceObj = new ObjectTest();


  public static void main(String[] args) {

     ObjectTest localObj = new ObjectTest();
   }
}