2013spjava试卷

//*********Found********
import __________________;
public class Java_1{
public static void main( String args[] ){
String s1 = "hashcode",
s2 = "HashCode";
String output =
"\"" + s1 + "\" 的Hash码是" +
s1.hashCode() +
"\n\"" + s2 + "\" 的Hash码是" +
s2.hashCode();
JOptionPane.showMessageDialog( null, output,
"显示字符串类的hash码",
//*********Found********
JOptionPane.______________________________ );
System.exit( 0 );
}
}
import java.awt.*;
import java.awt.event.*; import javax.swing.*;
//*********Found********
public class Java_2 ____________ JFrame implements ActionListener{ public static void main(String args[]){
Java_2 fr = new Java_2("Hello !");
fr.setSize(200,100);
JButton b = new JButton("确定");
//*********Found********
b._____________________(new Java_2());
fr.getContentPane().add(b);
fr.setVisible(true);
}
//*********Found********
public void actionPerformed(______________ e){
System.exit(0);
}
//*********Found********
public Java_2(________________){
super(str);
}
public Java_2(){
}
}
import java.text.*;
public class Java_3{
public static void main(String[] args){
Person p = new Student("王甜甜", "计算机科学");
System.out.println(p.getName() + ", "+ p.getDescription());
}
}
abstract class Person{
public Person(String n){
name = n;
}
//*********Found********
public _______________ String getDescription();
public String getName(){
return name;
}
private String name;
}
//*********Found********
class Student ___________ Person{
public Student(String n, String m){
super(n);
major = m;
}
//*********Found********
public String ____________________(){ return "学生专业是:" + major;
}
private String major;
}。