以下程序的输出结果为()。import math s=0 for i in range(1,10+1): m=int(math.sqrt(i) ) if
以下程序的输出结果为()。import math s=0 for i in range(1,10+1): m=int(math.sqrt(i) ) if m%2==0: continue s=s+i print(s)
以下程序的输出结果为()。import math s=0 for i in range(1,10+1): m=int(math.sqrt(i) ) if m%2==0: continue s=s+i print(s)
(11 )下面程序运行时输出结果为
C:\Program Files is a directory
请将程序补充完整。
import Java.io.*;
public class DirTest{
public static void main(String[] args){
File myDir = new File(" C:/Program Files/ " );
System.out.println
(myDir + (【 11 】 .isDirectory() ? " is " : " is not " ) + " a directory. " );
}
}
阅读下面程序
import javax.swing.JOptionPane;
public class Comparison{
public static void main(String args[]){
String firstNumber, //用户输入第1个数据变量
second Number, //用户输入第2个数据变量
result; //输出结果变量
int number1, //用于比较的第1个数
number2; //用于比较的第2个数
//用户输入第1个数据的字符串
firstNumber=JOptionPane. showInputDialog(“输入第1个整数:”);
//用户输入第2个数据的字符串
secondNumber=JOptionPane.showlnputDialog(“输入第2个整数:”);
//将字符串转换为整数类型
number1=Integer.parseInt(firstNumber);
number2=Integer.parseInt(secondNumber);
//初始化结果变量
___________________;
//比较两个数据
if(number1=number2)
result += number1 +" =" + number2;
if(number1 != number2 )
result += numberl +" !=" + number2;
if(number1 < number2 )
result = result + "\n" + numberl +" <" + number2;
if(number1 > number2 )
result = result + "\n" + number1 + ">" + number2;
if(number1 <= number2 )
result = result + "\n" + number1 +" <=" + number2;
if (number1 >= number2 )
result = result + "\n" + number1 + ">=" + number2;
//显示结果
JOptionPane.showMessageDialog(null,result," 比较结果",
JOptionPane. INFORMATION_MESSAGE);
System.exit(0);
}
}
为使程序能正确运行并得到合理的输出结果,初始化结果变量语句(下划线处)应是
A.result = ""
B.result = null
C.result = number1
D.result = number2
(20 )阅读下面程序
import javax.swing.JOptionPane;
public class Comparison {
public static void main(String args[] ){
String firstNumber, // 用户输入第 1 个数据变量
secondNumber, // 用户输入第 2 个数据变量
result; // 输出结果变量
int number1, // 用于比较的第 1 个数
number2; // 用于比较的第 2 个数
// 用户输入第 1 个数据的字符串
firstNumber = JOptionPane.showInputDialog(" 输入第 1 个整数 :" );
// 用户输入第 2 个数据的字符串
secondNumber = JOptionPane.showInputDialog(" 输入第 2 个整数 :" );
// 将字符串转换为整数类型
number1 = Integer.parseInt(firstNumber );
number2 = Integer.parseInt(secondNumber );
// 初始化结果变量
______________________;
// 比较两个数据
if (number1 == number2 )
result += number1 + " == " + number2;
if (number1 != number2 )
result += number1 + " != " + number2;
if (number1 < number2 )
result = result + "\n" + number1 + " < " + number2;
if (number1 > number2 )
result = result + "\n" + number1 + " > " + number2;
if (number1 <= number2 )
result = result + "\n" + number1 + " <= " + number2;
if (number1 >= number2 )
result = result + "\n" + number1 + " >= " + number2;
// 显示结果
JOptionPane.showMessageDialog(null,result," 比较结果 ",
JOptionPane.INFORMATION_MESSAGE );
System.exit(0 );
}
}
为使程序能正确运行并得到合理的输出结果,初始化结果变量语句 (下划线处 ) 应是
A ) result = ""
B ) result = null
C ) result = number1
D ) result = number2
【说明】
下面是一个Applet程序,程序的功能是在显示面板上输出字符串。当html页面被其他窗口遮挡后再次显示时,请给出输出结果。
import java.awt.*;
import java. (1). *;
public class MyApplet (2) Applet {
public void (3) (Graphics g) {
g.drawString(tip,20,40);
tip ="I am Java Applet";
}
public void init() {
tip ="welcome"; }
private (4) tip;
}
<html>
<head>
<title> A Simple Applet </title>
</head>
<body>
<applet code="MyApplet.class" width=800 height=400>
</applet>
</body>
</html>
网页输出 (5)
阅读以下说明和Java代码,填补空缺。
[说明]
java.util库中提供了Vector模板类,可作为动态数组使用,并可容纳任意数据类型。
该类的部分方法说明如下所示:
方法名 含义
add(k) 向vector对象的尾部添加一个元素k
removeElementAt(i) 删除序号为i的元素(vector元素序号从0开始)
isEmpty() 判断vector对象是否含有元素
size() 返回vector对象中所包含的元素个数
[Java代码]
Import ________;
public class JavaMain {
static private final int ________ =6;
public static void main(String[]args) {
Vector theVector=new Vector< _______ >();
//初始化theVector,将theVector的元素设置为0至5
for(int cEachItem=0; cEachItem<ARRAY_SIZE; cEachItem++)
theVector. add(________ );
showVector(theVector); //依次输出theVector巾的元素
theVector. removeElementAt(3);
showVector(theVector);
}
public static void showVector(Vector theVector){
if(theVector. isEmpty()){
System.out.printin("theVector is empty.");
return;
}
for(int loop=0; loop<theVector.size(); loop++) {
System.out.print(theVector.get(loop));
System.out.print(",");
}
System.out.printin();
}
}
该程序运行后的输出结果为:
0, 1, 2, 3, 4, 5
___________
下列程序中,若从键盘中输入的是大写字母C,则程序输出的结果是 import java.io.*; public class Exam{ public static void main(String args[]) int ch=0; System.out.println(”输入一个字符:”); try{ ch=System.in.read(); char ch_A='A',ch_Z='Z',; int delta_c=(int)ch_A+(int)ch_Z-ch; System.out.println(”编码后的字符为:”+(char)delta_c); } catch(IOException e){ e.printStackTrace(); } } }
A.C
B.Y
C.X
D.字母C的ASCII码的整型值
【Java代码】
import Java.util.ArrayList;
import java.util.List;
(1) class AbstractFile{
protected String name;
public void printName(){System.out.println(name);}
public abstract boolean addChild(AbstractFile file);
public abstract boolean removeChild(AbstractF ile file);
public abstract List<AbstractFile> getChildren();
}
class File extends AbstractFile{
public File(String name){this.name=name;}
public boolean addChild(AbstractFile file){return false;}
public boolean removeChild(AbstractFile file){return false;}
public List<AbstractFile> getChildren(){return (2) ;}
}
class Folder extends AbstractFile{
private List <AbslractFile> childList;
public Folder(String name){
this.name=name;
this.childList=new ArrayList<AbstractFile>();
}
public boolean addChild(AbstractFile file) { return childList.add(file);}
public boolean removeChild(AbstractFile file){return childList.remove(file);}
public (3) <AbstractFile> getChildren(){return (4) ;}
}
public class Client{
public static void main(String[] args){
//构造一个树形的文件/目录结构
AbstractFile rootFolder= new Folder("c:\\ ");
AbstractFile compositeFolder=new Folder("composite");
AbstractFile windowsFolder=new Folder("windows");
AbstractFile file=new File("TestComposite.java");
rootFolder.addChild(compositeFolder) ;
rootFolder.addChild(windowsFolder);
compositeFolder.addChild(file) ;
//打印目录文件树
printTree(rootFolder);
}
private static void printTree(AbslractFile ifile){
ifile.printName();
List <AbslractFile> children=ifile.getChildreno:
if(children==null) return;
for (AbstractFile file:children) {
(5) ;
}
}
}
该程序运行后输出结果为:
c:\
composite
TestComposite.java
Windows
当变量x=2,y=5时,以下程序的输出结果为 Do Until y>5 x=x*y y=y+1 Loop Print x
A.2
B.5
C.10
D.20
编译运行以下程序后,关于输出结果的说明正确的是()。 public class Conditional{ public static void main (String args[]){ int x=2: System.out.println("value is”+ ((x<1)?2:2)); } }
A.输出结果为:valueis22.2
B.输出结果为:value is 2
C.输出结果为:value is 2.0
D.编译错误
以下程序段的输出结果为______。 X=1 Y=4 Do Until Y>4 X=K*Y Y+Y+1 Loop Print X
A.1
B.4
C.8
D.20