Java程序ArrayIndexOutOfBounds

Question

我正在编写两个递归java程序，但它们都有错误。最大的方法在最终返回时有一个越界错误。第二个代码表示max是一种不兼容的类型。 我在Java方面相当新，代码可能看起来有点乱，所以欢迎任何有关如何使它更容易或更好的提示！

该程序找到数组中的最大数字：

   public static int largest(int data[], int n) {
      if (n == 0) {
      } 
      return largest(data, 0, n-1);  //line107
   }

   public static int largest(int array[], int LF, int RT){
      if (LF == RT){ //1 element array
      }

      else { 
      //   int large = largest(array, LF++, size - 1);
       //  return x = 

         int largeLF = array[LF];
         int largeRT = array[RT];  
         int mid = ((RT - LF) / 2) + LF;
         if (LF < mid - 1){
            if (array[LF] > largeLF){
               largeLF = array[LF];
            }
            largest(array, LF + 1, RT); //line 125
         }
         else if (RT > mid - 1){
            if (array[RT] > largeRT){
               largeRT = array[RT];
            }
            largest(array, LF, RT - 1); //line 131
         }
         else {
            if (array[mid] > largeLF){
               largeLF = array[mid];
            }    
         }
         if (largeRT > largeLF){
            LF = largeRT;

         }
         LF = largeLF;
      }
      return array[LF]; //line 144
   }

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 100
    at ArrayUtilities.largest(ArrayUtilities.java:144)
    at ArrayUtilities.largest(ArrayUtilities.java:131)
    at ArrayUtilities.largest(ArrayUtilities.java:131)
    at ArrayUtilities.largest(ArrayUtilities.java:125)
    at ArrayUtilities.largest(ArrayUtilities.java:125)
    at ArrayUtilities.largest(ArrayUtilities.java:125)
    at ArrayUtilities.largest(ArrayUtilities.java:125)
    at ArrayUtilities.largest(ArrayUtilities.java:107)
    at ArrayUtilitiesTest.main(ArrayUtilitiesTest.java:5)

此代码查找总和最大的数字块

   public static int maxBlock(int data[], int n) {
      if (n == 0) {
      } 
      else {
         maxBlock(data, n-1);
      }
      return n;
   }

   public static void maxBlock(int data[], int LF, int RT) {
      int n = RT;
      for (LF = 0; LF < n; LF++){
         for (RT = LF; RT < n; RT++){
            int sum = 0;
            for (int i = LF; i <= RT; i++){
               sum += data[i];
            }
            int max = data[0];
            for (LF = 0; LF < n; LF++){
               sum = 0;
               for (RT = LF; RT < n; RT++){
                  sum += data[RT];   
                  if (sum > max){
                     max = sum;
                  }
                  System.out.println(max);
               }
            }
           return max;
         } 
      }
   }

我仍然对返回感到困惑，因为它们不是全局变量，你如何传递值？

任何帮助都会很棒，谢谢！