更多"[单选题]在程序的下划线处应填入的选项是:
public class "的相关试题:
[单选题]下列程序的功能是将一个整数数组写入二进制文件。在程序的下划线处应填入的选项是:
import java.io.*;
public class XieShuzu{
public static void main(String[] a){
int [] myArray={10,20,30,40};
try{
DataOutputStream dos=new DataOutputStream(new FileOutputStream("ints.dat"));
for(int i=0;iA.writeArray
B.writeByte
C.writeInt
D.writeDouble
[单选题]在下列代码的下划线处应填入的内容是:
public class FirstSample {
public static void main(_____ args[]) {
System.out.println("你好!");
}
}
A.staff
B.double
C.int
D.String
[单选题]下列代码的下划线处应填入的方法名是:
import java.applet.*;
import java.awt.*;
public class Hello extends Applet {
public void _____(Graphics g){
g.drawString("How are you!", 10, 10);
}
}
A.repaint
B.println
C.paint
D.show
[单选题]要得到某目录下的所有文件名,在下列代码的下划线处应填入的内容是(两个下划线的内容相同):
_____ pathname = new _____(args[0]);
String[] filename = pathname.list();
A.FileInputStream
B.FileOutputStream
C.File
D.RandomAccessFile
[单选题]下列程序的功能是统计字符串中"array"的个数,在程序的空白处应填入的正确选项是:
public class FindKeyWords{
public static void main(sring[] args){
String text=
" An array is a data structur that stores a collection of"
+ "values of the same type . You access each individual value"
+ "through an integer index . For example,if a is an array"
+ "of inergers, then a[i] is the ith integer in the array.";
int arrayCount =0;
int idex = -1;
String arrarStr ="array";
index = text.indexof(arrayStr);
while(index ______ 0) {
++arrayCount;
index += arrayStr.length();
index = text.indexof(arrayStr,index);
}
System.out.println("the text contains" + arrayCount + "arrays");
}
}
A.<
B.=
C.<=
D.>=
[单选题]在下列程序的空白处,应填入的正确选项是:
import java.io.*;
public class writeInt{
public static void main(string[] a) {
int[ ] myArray = {10,20,30,40};
try{
DataOutputSystem dos= new DataOutputSystem(new FileOutputSystem("ints.dat"));
for(int i=0;iA.start( )
B.close( )
C.read( )
D.write( )
[单选题]在下列程序的空白处,应填入的正确选项是:
import java.io.*;
pulilc class ObjectStreamTest{
publilc static void main(string args[]) throws IOException{
ObjectOutputStream oos= new ObjectOutputStream (new FileOutputStream("serial.bin"));
java.util.Date d= new Java.util.Date();
oos. ______ (d);
ObjectInputStream ois= new ObjectInputStream(new FileOutputStream("serial.bin"));
try{
java.util.date restoredDate = (java.util.Date) ois.readObject();
System.out.println ("read object back from serial.bin file:" + restoredDate);
}catch (ClassNotFoundException cnf) {
System.out.println ("class not found");
}
}
}
A.WriterObject
B.Writer
C.BufferedWriter
D.writeObject
[单选题]下列Java语句从指定网址读取html文件,在下划线处应填上的选项是:
Reader in=new____(new URL(urlString).openStrream());
A.Reader
B.DataOutputStream
C.ByteArrayInputStream
D.InputStreamReader
[单选题]阅读下列程序
public class VariableUse{
public static void main (String[] args) {
int a;
if (a==8) {
int b=9;
System.out.println("a = "+a);
System.out.println("b = "+b);
}
System.out.println("a = "+a);
System.out.println("b = "+b);
}
}
该程序在编译时的结果是:
A.变量a未赋值
B.第二个System.out.println(“b = ”+b)语句中,变量b作用域有错
C.第二个System.out.println(“a = ”+a)语句中,变量a作用域有错
D.第一个System.out.println(“b = ”+b)语句中,变量b作用域有错
[单选题] 设有如下程序
Public class test {
Public static void main(String args[]) {
Integer intObj=Integer.valueOf(args[args.length-1]);
Int i = intObj.intValue();
If(args.length > 1)
System.out.println(i);
If(args.length > 0)
System.out.println(i - 1);
Else
System.out.println(i - 2);
}
}
运行程序 , 输入如下命令:
Java test 2
则输出为:
A. test
B. test -1
C. 0
D. 1
E. 2
[单选题]下列程序的输出结果是:
public class Test{
public static void main(String[] args){
int [] array={2,4,6,8,10};
int size=6;
int result=-1;
try{
for(int i=0;iA.Catch---1
B.Catch---2
C.Catch---3
D.以上都不对
[单选题] 下列程序运行的结果为:
Public class test {
Public static void main(String args[]) {
Int i;
Float f = 2.3f ;
Double d = 2.7;
I = ((int)Math.ceil(f)) * ((int)Math.round(d));
System.out.println(i);
}
}
A. 4
B. 5
C. 6
D. 6.1
E. 9
[单选题]以下程序的调试结果为?
Public class Outer{
Public String name = "Outer";
Public static void main(String argv[]){
Inner i = new Inner();
I.showName();
}
Private class Inner{
String name =new String("Inner");
Void showName(){
System.out.println(name);
}
}
}
A.输出结果 Outer
B.输出结果 Inner
C.编译错误,因 Inner 类定义为私有访问
D.在创建 Inner 类实例的行出现编译错误
[单选题]为使下列代码正常运行,应该在下划线处填入的选项是:
ObjectInputStream in=new_____(new FileInputStream("employee . dat"));
Employee[] newStaff=(Employee[])in.readObject();
in .cIose();
A.Reader
B.InputStream
C.ObjectInput
D.ObjectInputStream
[单选题]阅读下列程序
public class Test implements Runnable{
private int x=0;
private int y=o;
boolean flag=true;
public static void main(string[ ] args) {
Test r =new Test( );
Thead t1=new Thead(r);
Thead t2=new Thead(r);
t1.start( );
t2.start( );
}
public void run(){
while(flag) {
x++;
y++;
System.out.println("(" +x_ ","+y+")");
if (x>=10)
flag=false;
}
}
}
下列对程序运行结果描述的选项中,正确的是:
A.每行的(x,y)中,可能有;每一对(x,y)值都出现两次。
B.每行的(x,y)中,可能有;每一对(x,y)值仅出现一次。
C.每行的(x,y)中,可能有x=y;每一对(x,y)值都出现两次。
D.每行的(x,y)中,可能有x=y;每一对(x,y)值都出现一次。
[单选题]为使下列代码正常运行,应该在下划线处填入的选项是:
abstract class Person{
public Person(String n){
name=n;
}
public____String getDescription();
public String getName(){
return name;
}
private String name;
}
A.static
B.private
C.abstract
D.final
[单选题] 以下程序调试结果为:
Public class Test {
Int m=5;
Public void some(int x) {
M=x;
}
Public static void main(String args []) {
New Demo().some(7);
}
}
Class Demo extends Test {
Int m=8;
Public void some(int x) {
Super.some(x);
System.out.println(m);
}
}
A.5
B. 8
C. 7
D.无任何输出
E.编译错误
[单选题]要向Applet传递参数,应该在下列drawing.html文件的下划线处填入的选项是:
……
……
A.
B.
C.
D.
[单选题]为使下列代码正常运行,应该在下划线处填入的选项是:
int[] numbers=new int[n];
for(int i=0;iA.size
B.length
C.dimension
D.measurement