//问题1 class SS { //private  Singleton ///obj = new Singleton(); public  int counter1; public  int counter2 = 0;  public  SS() { counter1++; counter2++; } /*public static Singleton getInstance() { return obj; } */public static void main(){ SS obj = new SS();  System.out.println(obj.counter1); System.out.println(obj.counter2);}}   // main()未定义数组 //反编译命令是C:>javap -c -classpath . Singleton   //请高手留贴说明为什么运行不了   //问题2 public class AA{ public static void main(String args[]){    CC cc=new CC();  System.out.println(cc.toString());  } }   class BB{StringBuffer output=new StringBuffer("?); public String toString(){  return output;  }   }   class CC extends BB{  public String toString(){   return super.toString();   }    } //toString()不能把StringBuffer()类型转换为Stirng?

评论