package hubeiershi3;import java.util.Iterator;
import java.util.Map;
import java.util.Random;
import java.util.Set;
import java.util.TreeMap;public class RandomSortTest
{
public static void main(String[] args)
{
Map map = new TreeMap();
Random random = new Random();
for(int i = 0; i < 50; i++)
{
int number = random.nextInt(41) + 10;
Integer in = new Integer(number);
if(map.get(in) == null)
{
map.put(in, new Integer[1]);
}
else
{
int value = ((Integer)(map.get(args[i]))).intValue();
map.put(in, new Integer(value + 1));
}
}
Set set = map.entrySet();
for(Iterator iter = set.iterator(); iter.hasNext();)
{
Map.Entry entry = (Map.Entry)iter.next();
Integer key = (Integer)entry.getKey();
Integer valu = (Integer)entry.getValue();
System.out.println(key + ":" +valu);
}
}
}
import java.util.Map;
import java.util.Random;
import java.util.Set;
import java.util.TreeMap;public class RandomSortTest
{
public static void main(String[] args)
{
Map map = new TreeMap();
Random random = new Random();
for(int i = 0; i < 50; i++)
{
int number = random.nextInt(41) + 10;
Integer in = new Integer(number);
if(map.get(in) == null)
{
map.put(in, new Integer[1]);
}
else
{
int value = ((Integer)(map.get(args[i]))).intValue();
map.put(in, new Integer(value + 1));
}
}
Set set = map.entrySet();
for(Iterator iter = set.iterator(); iter.hasNext();)
{
Map.Entry entry = (Map.Entry)iter.next();
Integer key = (Integer)entry.getKey();
Integer valu = (Integer)entry.getValue();
System.out.println(key + ":" +valu);
}
}
}
at hubeiershi3.RandomSortTest.main(RandomSortTest.java:29)
像这样报错 我不知道是什么原因 也不知道怎么改
改为
for(int i = 0; i < args.length; i++)
可以在这句打个断点,看args[i]能不能取到值。不知道你的args数组有没有赋值。