nitially, there is a Robot at position (0, 0). Given a sequence of its moves, judge if this robot makes a circle, which means it moves back tothe original place.

The move sequence is represented by a string. And each move is represent by a character. The valid robot moves are R (Right), L (Left),U (Up) and D (down). The output should be true or false representing whether the robot makes a circle.

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Example 1:

Input: "UD" Output: true

Example 2:

Input: "LL" Output: false
class Solution {     public boolean judgeCircle(String moves) {         int x = 0;         int y = 0;         for (char ch : moves.toCharArray()) {             if (ch == 'U')                 y++;             if (ch == 'D')                 y--;             if (ch == 'L')                 x--;             if (ch == 'R')                 x++;         }         return x == 0 && y== 0; //检查是否回到了起点处     } }

 

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