I need help with these. In Java please. Any help is appreciated

1-Write a program OneSum.java that reads a sequence of integers from standard input and counts the number of them that are 0. How many instructions are executed in the data-processing loop?

2-Write a program TwoSum.java that reads in a sequence of integers from standard input from standard input, and counts the number of pairs that sum to exactly 0. How many instructions are executed in the data-processing loop? 6-Analyze the following code fragment mathematically and determine whether the order of growth of the running time is linear, quadratic, or cubic as a function of n. for (int i = 0; i < n; i++) for (int j = 0; j < n; j++) for (int k = 0; k < n; k++) c[i][j] += a[i][k] * b[k][j];

3-The following function returns a random string of length n. What is the order of growth of its running time as a function of n? public static String random(int n) { if (n == 0) return ""; int r = StdRandom.uniform(26); // between 0 and 25 char c = 'a' + r; // between 'a' and 'z' return random(n/2) + c + random(n - n/2 - 1); }