[Java程序7-1]
import java.util.*;
public class OrderList (1) {
private ArrayList<Order> orders;
public OrderList0 {
this.orders = new ArrayList<Order>( );
}
public void addOrder(Order orde0
this.orders.add(order);
}
public Iterator<Order> iterator( ) {
return (2) ;
}
public iht getNumberOfOrders0 {
return this.orders.size( );
}
}
[Java程序7-21]
import java.u61.*;
public class SalesSystem {
private ProductList catalog;
private OrderList sales;
private static PrintWriter stdOut = new PrintWriter(System.out, true);
public void statistic( ) {
for (Product product: (3) ) {
iht number = 0;
for (Order order: (4) ) {
for ( (5) : order) {
if (produet.equals(item.getProduct( )))
number += item. getQuantity( );
}
}
stdOut.println(product .getCode( ) +" "
+ product.getDescription( ) +" "
+ number +" "+ number * product.getPrice( ));
}
}
//其余的方法末列出
}
阅读下面程序
import java.io.*;
public class ByteStreamTest {
public static void main(String[] A) {
int [] myArray = {10,20,30,40 };
try{
DataOutputStream dos = new DataOutputStream ( new______ ("ints.dat"));
for (int i=0; i<myArray, length; i++) dos.writelnt( myArray[i] ); dos.close( );
System.out.println("Have written binary file ints.dat");
}
catch (IOException ioe){
Sy stem.out.println("IO Exception");
}
}
}
为保证程序正确运行,在程序中下划线处应填入的代码是()
阅读下面程序
import java.io.*;
public class TypeTransition{
public static void main(String args[]){
char a=’h’;
int i=100;
int j=97;
int aa=a+i;
System.out.println("aa="+aA) ;
char bb=(char)j;
System.out.println("bb="+bB) ;
}
} 如果输出结果的第二行为bb=a,那么第一行的输出是()
请阅读下面程序
import java.io.*;
public class ExceptionCatch {
public static void main(String args[]) {
try{
FilelnputStream fis=new FilelnputStream("text");
System.out.println("content of text is:");
}
catch(FileNotFoundException e) {
System.out.println(e);
System.out.println("message:"+e.getMessageO);
e.printStackTrace(System.out);
}
____{
System.out.println(e);
}
}
}
为保证程序正确运行,程序中下划线处的语句应是()
请阅读下面程序
import java.io. *;
public class TypeTransition {
public static void main(String args[]){
char a=’a’;
int i=l00;
long y=456L;
int aa=a+i;
long yy=y-aa;
System.out.print("aa = "+aA) ;
System.out.print("yy = "+yy);
} 程序运行结果是()
阅读下面写文件的程序
import java. io. *;
public class WriteFile{
public static void main(String[]A) {
int[]myArray={10,20,30,40};
try{
FileOutputStream f=new FlieOutStream("ints. dat");
DataOutputStream______=new DataOutputStream(f);
for(int i=0; i<myArray. length; i ++)
dos. writeInt(myArray[i]);
dos. close( );
System. out. prinfln("Have written binary file ints. dat");
}
catch(IOException ioe){
System. out. println("IO Exception");
}
}
在程序下画线处填入的正确选项是()
我来回答: