import java.util.*;class Generator {
int key = 0;
public String next() {
switch(key) {
default:
case 0 : key++; return "Snow White";
case 1 : key++; return "Bashful";
case 2 : key++; return "Doc";
case 3 : key++; return "Dopey";
case 4 : key++; return "Grumpy";
case 5 : key++; return "Happy";
case 6 : key++; return "Sleepy";
case 7 : key = 0; return "Sneezy";
}
}
public void fillA(String[] a)
{
for(int i = 0; i < a.length; i++)
a[i] = next();
}
public Collection fill(Collection<String> c, int n) {
for(int i = 0; i < n; i++)
c.add(next());
return c;
}
}public class Ex4 {
public static void main(String[] args) {
Generator gen = new Generator();
String[] a = new String[11];
gen.fillA(a);
for(String s : a)
System.out.print(s + ", ");
System.out.println();
System.out.println(gen.fill(new ArrayList<String>(), 11));
System.out.println(gen.fill(new LinkedList<String>(), 11));
System.out.println(gen.fill(new HashSet<String>(), 11));
System.out.println(gen.fill(new LinkedHashSet<String>(), 11));
System.out.println(gen.fill(new TreeSet<String>(), 11));
}
}
这是整个代码。。其中我对那个key++不是很明白,当选中0的时候那就选择Snow White,k++啥作用?在加一个Snow White?
依次输出那些形容词,key自加是为下次调用方法时执行下一个条件下语句
1,所以会转到case 1; 注意这个switch中虽然没有break;但是有return 语句。他同样会中断而不会让他一直执行下去。
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