Ask the user for a string and a substring of the given string. Using recursion (no...
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Ask the user for a string and a substring of the given string. Using recursion (no loops), write a method that returns the number of times the substring appears in the string. public static int count (String str, String sub) Below is a sample run: Enter a string: Welcome to Java Enter a substring: o The substring o appears 2 times in the string Welcome to Java 2. Write a method that given a string, return true if it is a nesting of zero or more pairs of parenthesis, like "(())" or "((())". Suggestion: check the first and last chars, and then recur on what's inside them. public static boolean nest Paren (String str) Write a test program that prompts the user to enter a string and displays whether the string is a nesting of zero or more pairs of parenthesis. Below is a sample run: Enter a string: ((())) The string ((())) is a nesting of zero or more pairs of parenthesis Ask the user for a string and a substring of the given string. Using recursion (no loops), write a method that returns the number of times the substring appears in the string. public static int count (String str, String sub) Below is a sample run: Enter a string: Welcome to Java Enter a substring: o The substring o appears 2 times in the string Welcome to Java 2. Write a method that given a string, return true if it is a nesting of zero or more pairs of parenthesis, like "(())" or "((())". Suggestion: check the first and last chars, and then recur on what's inside them. public static boolean nest Paren (String str) Write a test program that prompts the user to enter a string and displays whether the string is a nesting of zero or more pairs of parenthesis. Below is a sample run: Enter a string: ((())) The string ((())) is a nesting of zero or more pairs of parenthesis
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