Java：Occurrence of '_cls1'是什么意思

这个错误信息通常是由Java编译器生成的，表示在一个内部类中引用了外部类的成员变量或方法时，由于访问权限或作用域的问题，编译器生成了一个新的成员变量或方法来代替原来的成员变量或方法，并在名称的末尾添加了“_cls1”以示区分。通常解决方法是检查访问权限或作用域是否正确，或者使用其他方法来访问外部类的成员变量或方法。

相关问题

java indexof

The `indexOf()` method in Java is used to find the index of the first occurrence of a given character or substring in a given string.

Syntax:

public int indexOf(int ch)
public int indexOf(int ch, int fromIndex)
public int indexOf(String str)
public int indexOf(String str, int fromIndex)

Parameters:
- `ch` - The character to search for
- `fromIndex` - The index from where to start the search
- `str` - The substring to search for

Return Value:
- The index of the first occurrence of the given character or substring in the string, or -1 if not found.

Example:

String str = "Hello World";
int index = str.indexOf('o');
System.out.println("Index of 'o': " + index); // Output: Index of 'o': 4

index = str.indexOf("World");
System.out.println("Index of 'World': " + index); // Output: Index of 'World': 6

def get_occurrences_of_sequence(original_dataset: [], checked_sequence: ()) -> []:

# This function takes in two parameters:
# 1. original_dataset: a list of sequences that we want to search for occurrences of the checked_sequence
# 2. checked_sequence: a tuple representing the sequence that we want to count occurrences of in the original_dataset

# The function returns a list of integers representing the number of occurrences of the checked_sequence in each sequence of the original_dataset

occurrences_list = [] # create an empty list to store the number of occurrences of the checked_sequence in each sequence of the original_dataset

for sequence in original_dataset: # iterate through each sequence in the original_dataset
count = 0 # initialize a count variable to keep track of the number of occurrences of the checked_sequence in the current sequence
for i in range(len(sequence) - len(checked_sequence) + 1): # iterate through each possible starting index of the checked_sequence in the current sequence
if sequence[i:i+len(checked_sequence)] == checked_sequence: # if the current slice of the sequence matches the checked_sequence, increment the count
count += 1
occurrences_list.append(count) # append the count to the occurrences_list for the current sequence

return occurrences_list # return the list of occurrence counts