思路：略，很简单

java版本

class Solution {    public boolean judgeCircle(String moves) {                int x = 0;        int y = 0;        char[] movestmp = moves.toCharArray();        for(char key : movestmp)        {            switch (key) {            case 'U':            {                y += 1;                break;            }            case 'D':            {                y--;                break;            }            case 'L':            {                x--;                break;            }            case 'R':            {                x++;                break;            }                            default:                break;            }        }        return x == 0 && y == 0;    }}

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