java布尔方法返回语句
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java boolean method return statement
提问by user2817232
I'm trying to program a game, and I'm making methods to check the different sides of a player for terrain. I'm using a boolean method, but netbeans is telling me I don't have a return statement.
我正在尝试编写游戏程序，并且正在制定方法来检查玩家不同侧面的地形。我使用的是布尔方法，但 netbeans 告诉我我没有 return 语句。
public boolean checkTerrainDown(Level levelToCheck){
for(Terrain terrainToCheck: levelToCheck.levelTerrain){
if(y+h<terrainToCheck.getY()){
return true;
}else{
return false;
}
}
}
采纳答案by rgettman
What if there is no Terrainto check? Then the body of the forloop never gets executed. You have no returnstatement after the forloop to account for this case. What would you have Java return in this case?
如果没有Terrain检查怎么办？然后for循环体永远不会被执行。您return在for循环之后没有任何语句来说明这种情况。在这种情况下，您希望 Java 返回什么？
Place a returnstatement after the forloop to handle the case in which there's no Terrainin the Level's levelTerrain. That way, every possible case of execution will returnsomething.
放置一个return语句后for循环处理中没有的情况下Terrain在Level的levelTerrain。这样，每个可能的执行案例都会return有所作为。
回答by Yellow Flash
if the for loopdoesn't executed then there is no return statement will be executed.
如果for loop没有执行，则不会执行 return 语句。
回答by sunysen
public boolean checkTerrainDown(Level levelToCheck){
//add this line
boolean mark = false;
for(Terrain terrainToCheck: levelToCheck.levelTerrain){
if(y+h<terrainToCheck.getY()){
//add this line,remove this //return true;
mark = true;
//add this line
break;
}
//else{
//return false;
//}
}
//add this line
return mark;
}
