/**
 * Problem:
 * Determine whether a string is unique.
 */

public class Solution1 {
	/**
	 * Solution:
	 *
	 * Analysis:
	 * Time Complexity:
	 * Space Complexity:
	 */
	public static boolean isUnique(String str) {

    }
}
@@ -215,12 +215,551 @@
 ) %7B%0A
+%09%09
 %0A    %7D%0A
-%7D
+%0A%09public static void main(String%5B%5D args) %7B%0A        // unique string returns true%0A%09%09assert (isUniqueArray(%22abcdef%22) == true);%0A%09%09assert (isUniqueBit(%22abcdef%22) == true);%0A%09%09assert (isUniqueHash(%22abcdef%22) == true);%0A%09%09%0A%09%09// empty string is unique.%0A%09%09assert (isUniqueArray(null) == true);%0A%09%09assert (isUniqueBit(null) == true);%0A        assert (isUniqueHash(null) == true);%0A%09%09%0A%09%09// normal test%0A        assert (isUniqueArray(%22aaaaa%22) == false);%0A        assert (isUniqueBit(%22aaaaa%22) == false);%0A        assert (isUniqueHash(%22aaaaa%22) == false);%0A%0A%09%7D%0A%7D%0A

add test cases in main function