Java solution

• ``````/*
* Initially, 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 to the 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.
Input: "UD"
Output: true
Input: "LL"
Output: false

*/
public class RobotProblem {
public boolean judgeCircle(String moves) {
int up=0,down=0,left=0,right=0;
char[] ch=moves.toCharArray();
for(int i=0;i<ch.length;i++){
switch(ch[i]) {
case 'U':
up++;
break;
case 'D':
down++;
break;
case 'L':
left++;
break;
case 'R':
right++;
break;
default:
System.out.println(ch[i]+" is an invalid move");
break;
//invalid move
}

}
if((up-down==0)&(right-left==0))
return true;
else
return false;

}

}

``````

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