我如何使此代码起作用? 我需要从3个场景中返回语句,目前在String robotInfo上出现错误。
String generateStatusReport(Robot robot) {
String robotStatus;
String robotWall;
String robotGround;
String robotInfo = robotStatus + robotWall + robotGround;
if(isRobotDead(robot)) {
robotStatus = ("The robot is dead.");
} else {
robotStatus = ("The robot is alive.");
if(isRobotFacingWall(robot)) {
robotWall = ("The robot is facing a wall.");
} else {
robotWall = ("The robot is not facing a wall.");
}
if(isItemOnGroundAtRobot(robot)) {
robotGround = ("There is an item here.");
} else {
robotGround = ("There is no item here.");
}
}
return robotInfo;
}
我会将您的连接移至条件语句之后但return语句之前:
String generateStatusReport(Robot robot) {
String robotStatus;
String robotWall;
String robotGround;
if(isRobotDead(robot))
robotStatus = ("The robot is dead.");
else {
robotStatus = ("The robot is alive.");
if(isRobotFacingWall(robot))
robotWall = ("The robot is facing a wall.");
else
robotWall = ("The robot is not facing a wall.");
if(isItemOnGroundAtRobot(robot))
robotGround = ("There is an item here.");
else
robotGround = ("There is no item here.");
}
String robotInfo = robotStatus + robotWall + robotGround;
return robotInfo;
}
或仅返回串联:
return robotStatus + robotWall + robotGround;
您需要初始化字符串以获取robotInfo中的值
String robotStatus;
String robotWall;
String robotGround;