请别再拿“String s = new String("xyz");创建了多少个String实例”来面试了吧

allskylove本来就是反对低调对待技术问题的人，他认为“互相攻击”才能带来实质的内容，你可以看看他大部分的回复，
都是"挑衅"性的。所以别动不动就讨厌这个人，那个人，难道批评就一定是为了显得自己NB？ 批评就不能不带目的性？

中国名族真是郁闷的名族，闷骚的名族，你闷骚得还有道理了，连点刺激都受不了，搞什么飞机，钓鱼岛，你继续强烈谴责吧！打他娘的！还说个毛！

构造器自身的返回值类型是void？ 构造器自身返回的类型是它自己本身，不然怎么构造实例呢？返回都没有返回！

2.12 Constructors

A constructor is used in the creation of an object that is an instance of a class. The constructor declaration looks like a method declaration that has no result type.

3.9 Specially Named Initialization Methods

At the level of the Java virtual machine, every constructor (§2.12) appears as an instance initialization method that has the special name <init>. This name is supplied by a compiler. Because the name <init> is not a valid identifier, it cannot be used directly in a program written in the Java programming language. Instance initialization methods may be invoked only within the Java virtual machine by the invokespecial instruction, and they may be invoked only on uninitialized class instances. An instance initialization method takes on the access permissions (§2.7.4) of the constructor from which it was derived.

4.3.3 Method Descriptors

A method descriptor represents the parameters that the method takes and the value that it returns:

MethodDescriptor:
     ( ParameterDescriptor* ) ReturnDescriptor

A parameter descriptor represents a parameter passed to a method:

ParameterDescriptor:
     FieldType

A return descriptor represents the type of the value returned from a method. It is a series of characters generated by the grammar:

ReturnDescriptor:
     FieldType
    V

The character V indicates that the method returns no value (its return type is void).

4.4.2 CONSTANT_Fieldref, CONSTANT_Methodref, and CONSTANT_InterfaceMethodref
   ...
       name_and_type_index

The value of the name_and_type_index item must be a valid index into the constant_pool table. The constant_pool entry at that index must be a CONSTANT_NameAndType_info (§4.4.6) structure. This constant_pool entry indicates the name and descriptor of the field or method.

If the name of the method of a CONSTANT_Methodref_info or CONSTANT_InterfaceMethodref_info begins with a '<' ('u003c'), then the name must be one of the special internal methods (§3.8), either <init> or <clinit>. In this case, the method must return no value.

4.9.4 Instance Initialization Methods and Newly Created Objects

Creating a new class instance is a multistep process. The Java statement

    ...

    new myClass(i, j, k);
    ...

can be implemented by the following:

    ...

    new     #1                   // Allocate uninitialized space for myClass
    dup                          // Duplicate object on the operand stack
    iload_1                      // Push i
    iload_2                      // Push j
    iload_3                      // Push k
    invokespecial myClass.<init> // Initialize object
    ...

This instruction sequence leaves the newly created and initialized object on top of the operand stack. (More examples of compiling Java code to the instruction set of the Java Virtual Machine are given in Chapter 7, "Compiling for the Java Virtual Machine.")
The instance initialization method <init> for class myClass sees the new uninitialized object as its this argument in local variable 0. It must either invoke an alternative instance initialization method for class myClass or invoke the initialization method of a superclass on the this object before it is allowed to do anything else with this.

public class CtorDemo {
    public static void main(String[] args) {
        new Object();
    }
}

0:   new     #2; //class java/lang/Object
3:   dup
4:   invokespecial   #1; //Method java/lang/Object."<init>":()V
7:   pop
8:   return

0:   aload_0
1:   invokespecial   #1; //Method java/lang/Object."<init>":()V
4:   return

兄弟你方向搞错了，<init> 方法只是jvm内部调用的，并不是语言级别的，而是虚拟机调用的！真正到语言级别方法（构造器调用的时候） 返回的是类本身 ，比如 MyClassA a=new MyClassA(); 明显返回了类本身，才赋值给了变量a, 另外如果没有返回值，不管是方法还是构造器 都应该有些void ，由此看来， 构造器自身返回的类型是它自己本身.

3.9 Specially Named Initialization Methods

...

A class or interface has at most one class or interface initialization method and is initialized (§2.17.4) by invoking that method. The initialization method of a class or interface is static and takes no arguments. It has the special name <clinit>. This name is supplied by a compiler. Because the name <clinit> is not a valid identifier, it cannot be used directly in a program written in the Java programming language. Class and interface initialization methods are invoked implicitly by the Java virtual machine; they are never invoked directly from any Java virtual machine instruction, but are invoked only indirectly as part of the class initialization process.