請看看下面兩道Java題,選擇哪個(gè)答案,并請說明原因!
1．指出正確的表達(dá)式().
A． byte = 128;
B． Boolean = null;
C． long l = 0xfffL;
D． double = 0.9239d;
2．指出下列程序運(yùn)行的結(jié)果
public class Example{
String str=new String("good");
char[]ch={'a','b','c'};
public static void main(String args[]){
Example ex=new Example();
ex.change(ex.str,ex.ch);
System.out.print(ex.str+" and ");
System.out.print(ex.ch);
}
public void change(String str,char ch[]){
str="test ok";
ch[0]='g';
}
}
A．good and abc
B．good and gbc
C．test ok and abc
D．test ok and gbc