單項選擇題

public class Pet{    
private String name;    
public Pet(){ 
System.out.print(1);    } 
public Pet(String name){       
System.out.print(2);    } } 
public class Dog extends Pet{    
public Dog(){ 
System.out.print(4);    } 
public Dog(String name){       
this(); 
System.out.print(3);    } } 
執(zhí)行new Dog(“棕熊”);后程序輸出是哪項?()  

A. 143
B. 423
C. 243
D. 1134

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