rtti.java

来自「java2参考大全上的例子的源码和自己的理解.」· Java 代码 · 共 40 行

package getclass;

/**
 这个程序的输出如下所示：

 x is object of type: X
 y is object of type: Y
 y’s superclass is X
 */

// Demonstrate Run-Time Type Information.

class X {
  int a;
  float b;
}

class Y
    extends X {
  double c;
}

class RTTI {
  public static void main(String args[]) {
    X x = new X();
    Y y = new Y();
    Class clObj;

    clObj = x.getClass(); // get Class reference
    System.out.println("x is object of type: " +
                       clObj.getName());
    clObj = y.getClass(); // get Class reference
    System.out.println("y is object of type: " +
                       clObj.getName());
    clObj = clObj.getSuperclass();
    System.out.println("y's superclass is " +
                       clObj.getName());
  }
}