《JAVA 语言编程》课程试卷 B
适用专业： 考试日期： 闭卷
所需时间：120 分钟 总分：100 分
一、输出结果题：(共 6 小题，每小题 5 分，共 30 分)
1、public class Arrays {
public static void main(String[] args) {
int[] a1 = { 1, 2, 3, 4, 5 };
int[] a2;
a2 = a1;
for(int i = 0; i < a2.length; i++)
a2[i]=a2[i]+i;
for(int i = 0; i < a1.length; i++)
System.out.println( "a1[" + i + "] = " + a1[i]);
}
}
2、public class ArrayCopyDemo {
public static void main(String[] args) {
char[] copyFrom = {'d','e','c','a','f','f','e','i','n','a'};
char[] copyTo = new char[7];
System.arraycopy(copyFrom, 2, copyTo, 0, 7);
System.out.println(new String(copyTo));
}
}
3、public class BankAccount {
private int accountNumber;
private float balance;
public BankAccount(int number, float initBal){
accountNumber = number;
balance = initBal;}
public String toString(){
return("Account #" + accountNumber +" with balance " + new
java.text.DecimalFormat("$0.00").format(balance));}}
public class AccountTester {
public static void main(String args[]) {
BankAccount anAccount;
anAccount = new BankAccount(100023,100);
System.out.println(anAccount);}
}
4、class A1{
int x = 20;
public void setx(int i){
x = i;}
void printa(){
System.out.println(x);}
}
class B1 extends A1{
int x=1;
void printb() {
super.x = super.x +10 ;
System.out.println("super.x= " + super.x + " x= " + x);}
}
public class Exam4_4Test {
public static void main(String[] args){
A1 a1 = new A1();
a1.setx(4);
a1.printa();
B1 b1 = new B1();
b1.printb();
b1.printa();
b1.setx(6);
b1.printb();
b1.printa();}
}
5、abstract class Glyph {
abstract void draw();
Glyph() {
System.out.println("Glyph() before draw()");
draw();
System.out.println("Glyph() after draw()");}
}
class RoundGlyph extends Glyph {
int radius = 1;
RoundGlyph(int r) {
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