下面是一段javabean程序,该程序的运行结果是( )。public class NullTest{public static void main(String[]?args){int M=0;String str=null;StringBuffer sb=new StringBuffer("=");sb.append(str);sb.append(M++);System.out.println(sb.toString( ));}}A.=nullB.=null0C.=null1D.=nullM

下面是一段javabean程序,该程序的运行结果是( )。public class NullTest{public static void main(String[]?args){int M=0;String str=null;StringBuffer sb=new StringBuffer("=");sb.append(str);sb.append(M++);System.out.println(sb.toString( ));}}

A.=null
B.=null0
C.=null1
D.=nullM

参考解析

解析:本题考查学生对javabean程序的熟悉程度,尤其是数值类型数据和字符串类型数据的掌握情况。M是整型变量,其值为0,str是字符串,sb是字符串空间,其中存放字符“=”,append是字符串添加函数,M++为自增运算符,它的特点是先取M的值作为表达式的值,再进行自增运算。程序的运算过程是:先将null拼接到“=”的后面,得字符串“=null”,再将0作为字符拼接到“=null”的后面,得“=null0”,M自增为1,输出结果为:=null0。

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