arraylist给“不能解决”和“不能解决一个类型”的错误（日食）

Question

我正在写一个选择排序程序，它仍然是未完成的，所以有很多错误，但我'我想找首先要解决的是，日食错误不断给我：

thelist cannot be resolved to a type 

，并再次，在程序的其余部分：

thelist cannot be resolved 

我的程序是这样的：

import java.util.ArrayList; 
public class SelectionSort { 

public static void main(String[] args) { 
    final int N = Integer.parseInt(args[0]); 
    //populate list with number from 1 to N 

    // Create an ArrayList containing Integer type elements 
    ArrayList<Integer> thelist = new ArrayList(); 

    //while loop to accept a new value from random generator 

    //call sort method 
} 

public static void sort(final thelist<Integer> list) { 

    // declare an int variable to hold value of index at which the element 
    // has the smallest value 
     int smaller = 0; 
     int b=0; 

    // declare an int variable to hold the smallest value for each iteration 
    // of the outer loop 
     int smallerindex = 0;  

     for(int a=1;a<thelist.size();a++){ 
      /* find the index at which the element has smallest value */ 
      // initialize variables 
      smaller = thelist.get(a-1); 
      smallerindex = a-1; 

      for(b=a;b<thelist.size();b++){ 
       if(thelist.get(b)<smaller){ 
        // update smallest 
        smaller = thelist.get(b); 
        smallerindex = b; 
       } 
      } 
     // do nothing if the curIndex has the smallest value 
      //Swap the smallest element with the first element of unsorted subarray 
      int temp = thelist.get(destIndex); 
      thelist.set(destIndex, thelist.get(sourceIndex)); 
      thelist.set(sourceIndex, temp); 

     } 
    } 

}

Answer 1

在你的排序方法你是给的thelist作为参数列表的类型：

public static void sort(final thelist<Integer> list) {

改变它：

public static void sort(final ArrayList<Integer> list) {

然后在main方法当你需要调用排序方法时，你可以这样称呼它：

//call sort method 
sort(thelist); 

这就是您将列表“列表”并将其用于您的方法的方式。