题目内容
以下程序的调试结果为？class Base{public final void amethod（){System.out.println（"amethod");}}public class Fin extends Base{public static void main（String argv[]){Base b = new Base（);b.amethod（);}}
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考虑如下代码：
class Tree{}
class Pine extends Tree{}
class Oak extends Tree{}
public class Forest {
public static void main(String[] args ) {
Tree tree = new Pine();
if(tree instanceof Pine )
System.out.println("Pine" );
if(tree instanceof Tree )
System.out.println("Tree" );
if(tree instanceof Oak )
System.out.println("Oak" );
else
System.out.println("Oops" );
}
}
则输出结果中有哪些？
编译和运行以下程序结果为：
1: public class Q21 {
2: int maxElements;
3: void Q21() {
4: maxElements = 100;
5: System.out.println(maxElements);
6: }
7: Q21(int i) {
8: maxElements = i;
9: System.out.println(maxElements);
10: }
11: public static void main(String[] args) {
12: Q21 a = new Q21();
13: Q21 b = new Q21(999);
14: }
15: }
下列说法错误的一项是？
下列程序运行的结果为：
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 ");
Sytem.out.print(ex.ch);
}
public void change(String str,char ch[]){
str="test ok";
ch[0]='g';
}
}
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