i need help writing out java methods for the following....

public static java.lang.String interleaveWithRuns(java.lang.String s, java.lang.String t) 

Returns a string obtained by alternating characters from two given strings, starting with the first character of the first string. If one of the strings is longer, the extra characters are appended to the end of the result. Runs of the same character are kept together. For example

given "abc" and "xyz", returns "axbycz"

given "abcde" and "xyz", returns "axbyczde"

given "abcde" and "abc", returns "aabbccde"

given "abbcde" and "xxxyzzzz", returns "axxxbbyczzzzde"

public static void triangleWord(java.lang.String s) 

Given a string, prints n lines of output as illustrated below, where n is the length of the string. As an example, given the string "banana", the output should be:

 a na ana nana anana banana 

public static int longestRun(java.lang.String s) 

Returns the length of the longest consecutive run of the same character in a string s. For example, for "baaanaannnnaa", the method returns 4, since there is a run of four 'n' characters. For "banana" the method returns 1.

public static boolean isArithmetic(java.lang.String text) 

Given a string of text containing numbers separated by commas, returns true if the numbers form an arithmetic sequence (a sequence in which each value differs from the previous one by a fixed amount). For example,

given "2,4,6,8", the method returns true

given "-2,5,12,19,26", returns true

given "2,4,7", returns false

given "1,2,23skidoo", returns false

The method should return true for any string containing two or fewer numbers and false for any invalid string. Assume that the string does not contain whitespace before or after the comma.