Question

我正在与可比较的arraylists合作。我有这些错误： - 语法错误，插入“...... VariableDeclaratorId”完成 FormalParameterList - 方法断点：排序[entry] - mergesort（）这是我的代码，我该怎么办？

import java.util.ArrayList;
import java.util.List;
public class Sorts 
{
public ArrayList<Comparable> yay = new ArrayList<Comparable>();
public ArrayList<Comparable> helper = new ArrayList<Comparable>();

public Sorts() 
{

}

private void mergesort(List<Comparable> yay, int low, int high)
{
 if (low < high) 
{
  int middle = low + (high - low) / 2;
  mergesort(yay, low, middle);
  mergesort( yay, middle + 1, high);
  merge(low, middle, high);
}
}

private void merge(int low, int middle, int high) 
{
for (int i = low; i <= high; i++) 
{
  helper.set(i,yay.get(i)) ;
}

int i = low;
int j = middle + 1;
int k = low;
while (i <= middle && j <= high) 
{
  if (helper.get(i).compareTo( helper.get(j))<=0) 
  {
    yay.set(k, helper.get(i));
    i++;
  } 
  else 
  {
    yay.set(k, helper.get(j));
    j++;
  }
  k++;
}

while (i <= middle) 
{
  yay.set(k, helper.get(i));
  k++;
  i++;
}
}

public static void main(String[] args) 
{
ArrayList<Comparable> bla = new ArrayList<Comparable>();
bla.add(2);
bla.add(4);
bla.add(3);
bla.add(1);
  Sorts test = new Sorts();
  System.out.println(bla);
  test.mergesort(bla, 0, 0);
  System.out.println("Sorted:");
  for(int i=0; i< bla.size();i++)
  {
      System.out.println(bla.get(i));
  }
  }
}

Answer 1

private void mergesort(List<Comparable>)，您指定了参数类型，但未给它命名，例如：

private void mergesort(List<Comparable> list)

MergeSort问题：“...... VariableDeclaratorId”完成FormalParameterList

1 个答案: