translation: Add Python and Java code for EN version (#1345)

* Add the intial translation of code of all the languages

* test

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* Add Python and Java code for EN version

en/codes/java/chapter_computational_complexity/iteration.java

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+/**
+ * File: iteration.java
+ * Created Time: 2023-08-24
+ * Author: krahets (krahets@163.com)
+ */
+
+package chapter_computational_complexity;
+
+public class iteration {
+    /* for loop */
+    static int forLoop(int n) {
+        int res = 0;
+        // Loop sum 1, 2, ..., n-1, n
+        for (int i = 1; i <= n; i++) {
+            res += i;
+        }
+        return res;
+    }
+
+    /* while loop */
+    static int whileLoop(int n) {
+        int res = 0;
+        int i = 1; // Initialize condition variable
+        // Loop sum 1, 2, ..., n-1, n
+        while (i <= n) {
+            res += i;
+            i++; // Update condition variable
+        }
+        return res;
+    }
+
+    /* while loop (two updates) */
+    static int whileLoopII(int n) {
+        int res = 0;
+        int i = 1; // Initialize condition variable
+        // Loop sum 1, 4, 10, ...
+        while (i <= n) {
+            res += i;
+            // Update condition variable
+            i++;
+            i *= 2;
+        }
+        return res;
+    }
+
+    /* Double for loop */
+    static String nestedForLoop(int n) {
+        StringBuilder res = new StringBuilder();
+        // Loop i = 1, 2, ..., n-1, n
+        for (int i = 1; i <= n; i++) {
+            // Loop j = 1, 2, ..., n-1, n
+            for (int j = 1; j <= n; j++) {
+                res.append("(" + i + ", " + j + "), ");
+            }
+        }
+        return res.toString();
+    }
+
+    /* Driver Code */
+    public static void main(String[] args) {
+        int n = 5;
+        int res;
+
+        res = forLoop(n);
+        System.out.println("\nSum result of the for loop res = " + res);
+
+        res = whileLoop(n);
+        System.out.println("\nSum result of the while loop res = " + res);
+
+        res = whileLoopII(n);
+        System.out.println("\nSum result of the while loop (with two updates) res = " + res);
+
+        String resStr = nestedForLoop(n);
+        System.out.println("\nResult of the double for loop traversal = " + resStr);
+    }
+}