题目内容
程序代码如下，请问会输出什么结果？_________________。import java.util.*;class Excute5{public static void main(String[] args){TreeMap map =new TreeMap();map.put("001","One");map.put("002","Two");map.put("003","Three");map.put("001","Four");Set keys=map.keySet();System.out.println("键的数目是："+keys.size());}}
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当编译运行下列程序时，会出现什么结果_________________。import java.util.*;class Excute6{public static void mA(List list){list.add(Double.toString(8.1));System.out.println(list.get(1));}public static void main(String[] args){ArrayList list =new ArrayList();list.add("Hello One");mA(list);}}
当编译运行下列程序时，会出现什么结果_________________。import java.util.*;class Excute7{static int sumUp(List list){int sum=0;for(Iterator iter=list.iterator();iter.hasNext();)sum+=(int)iter.next();return sum;}public static void main(String[] args){ArrayList list =new ArrayList();for(int k=1;k<11;k=k*2+1) list.add(k);System.out.println(sumUp(list));}}
当编译运行下列程序时，会出现什么结果______。import java.util.*;interface Book{public String mX();}class ComputerBook implements Book{public String mX(){return "mX()of ComputerBook is been called!";};public String mY(){return "mY()of ComputerBook is been called!";};}class ProgramBook extends ComputerBook{public String mY(){return "mY()of ProgramBook is been called!";};public String mZ(){return "mZ()of ProgramBook is been called!";};}class Excute8{public static void main(String[] args){ArrayList list = new ArrayList();list.add(new ProgramBook());list.add(new ProgramBook());for(int k=0;k
如下的程序段输出的结果是__________________import java.util.*;public class Strtest{public static void main(String[] args){String s=new String("we go,to our，compus");StringTokenizer token=new StringTokenizer(s,",");int n=token.countTokens();String array[]=new String[n];for(int i=0;token.hasMoreTokens();i++){array[i]=token.nextToken();System.out.printf("%s,",array[i]);}System.out.printf("\n%d,",n);}}
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