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One possible method for reading a substring that contains a key and value from a string that has square brackets using Java is as follows:

1. Identify the start and end position of the substring within the square brackets. This can be done using methods such as indexOf() and substring().

2. Extract the substring between the start and end positions.

3. Split the substring into key and value using a delimiter, such as a colon or equals sign.

4. Parse and store the key and value as necessary.

For example, if the input string is "[key:value]", the Java code to read the key and value would look something like this:

String input = "[key:value]";

// Get the start and end positions of the substring
int start = input.indexOf("[") + 1;
int end = input.indexOf("]");

// Extract the substring between the square brackets
String substring = input.substring(start, end);

// Split the substring into key and value using a colon delimiter
String[] parts = substring.split(":");

// Parse and store the key and value as necessary
String key = parts[0];
String value = parts[1];

System.out.println("Key: " + key);
System.out.println("Value: " + value);

This code would output:

Key: key
Value: value