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1£®public class ExSuper {
String name;
String nick_name;
public ExSuper(String s, String t) {
name = s;
nick_name = t;
}
public String toString() {
return name;
}
}
public class Example extends ExSuper{
public Example(String s, String t) {
super(s, t);
}
public String toString(){
return name+¡± a.k.a ¡°+nick_name;
}
public static void main(String[] args) {
ExSuper a=new ExSuper(¡°First¡±,¡±1st¡±);
ExSuper b=new Example(¡°Second¡±,¡±2nd¡±);
System.out.println(¡°a is ¡°+a.toString());
System.out.println(¡°b is ¡°+b.toString());
}
}
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B ÔËÐнá¹ûΪ£º
a is First
b is second
CÔËÐнá¹ûΪ£º
a is First
b is Second a.k.a 2nd
DÔËÐнá¹ûΪ£º
a is First a.k.a 1nd
b is Second a.k.a 2nd
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abstract void amethod();
static int i;
}
Public class Mine extends MineBase {
public static void main(String argv[]){
int[] ar=new int[5];
for(i=0;i
System.out.println(ar[i]);
}
}
}
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public static void main(String[] srgs){
try{
return;}
finally{System.out.println(¡°Finslly¡±);
}
}
}
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B select studentid,count(*) from student;
C select depart,max(avg(age)) from student group by depart;
D select tudentid,avg(score),max(score) from score group by studentid;
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C application request session page D page request session application
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public static void main(String[] arge){
static int x[]=new int[15];//Êý×éÖ»ÄÜÓÃfinal A
system.out.println(x[5]);
}
}
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create table lesson(lesson number(10)primary key,lessonname
varchar2(20));
create table score(studentid number(10)foreign key references
student(studentid),lessonid number(10) foreign key references
lesson(lessonid),score number(3));
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