使用 new 运算符和 .class.newInstance() 方法创建 java 对象

Question

我有以下代码片段

public class Test2 {

    public static void main(String[] args) {

Test test = null;
        try {
test = Test.class.newInstance(); 
if(test!=null)
                System.out.println("test class instance created");
            System.out.println(test.getA()+"\t"+test.getB());
} catch (InstantiationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

public class Test {

    private int a;
    private int b;

    public Test() {
        // TODO Auto-generated constructor stub
        System.out.println("test class constructor executed");
    }

    public int getA() {
        return a;
    }
    public void setA(int a) {
        this.a = a;
    }
    public int getB() {
        return b;
    }
    public void setB(int b) {
        this.b = b;
    }

    static {
        System.out.println("static block of Test class exectuted");
    }


    {
        System.out.println("test class IIB executed");
    }

我正在尝试使用

创建 Test 类的实例

test = Test.class.newInstance(); 

我的问题:这是正确的方法吗？

两者之间有什么区别

Test t1 = new Test();

以及上述方法？

当我运行 Test2 类时，我得到以下信息:

static block of Test class exectuted
test class IIB executed
test class constructor executed
test class instance created
0   0

Answer 1

is this the correct way to do??

不，事实并非如此。使用新。因为Class.newInstance() :

Use of this method effectively bypasses the compile-time exception checking that would otherwise be performed by the compiler.