prefer isEmpty over length() == 0

src/main/java/appeng/container/implementations/ContainerCraftConfirm.java

@@ -180,7 +180,7 @@ public class ContainerCraftConfirm extends AEBaseContainer
 			this.sendCPUs();
 		}
 
-		this.noCPU = this.cpus.size() == 0;
+		this.noCPU = this.cpus.isEmpty();
 
 		super.detectAndSendChanges();
 

src/main/java/appeng/container/implementations/ContainerCraftingStatus.java

@@ -94,7 +94,7 @@ public class ContainerCraftingStatus extends ContainerCraftingCPU
 			this.sendCPUs();
 		}
 
-		this.noCPU = this.cpus.size() == 0;
+		this.noCPU = this.cpus.isEmpty();
 
 		super.detectAndSendChanges();
 	}