Question

每当我编译程序时，我都会收到此错误：java.lang.reflect.InvocationTargetException当我将BorderPane的内部节点（HBox）设置为底部时，会发生错误。为什么我会收到此错误，如何解决？

// remove trailing newline
char * newline = NULL;
if( NULL != (newline = strstr( buf, "\n") ) )
{ // then trim newline
    *newline = '\0';
}

// data declarations for removing space characters
char *sourceIndex = buf;
char *targetIndex = buf;

// following loop removes space characters, in place
// and stops when the string terminator char encountered
for( ; sourceIndex; sourceIndex++)  
{
    if( ' ' != *sourceIndex )
    { // then char to have in final output
        *targetIndex = *sourceIndex; // copy it
        targetIndex++;               // step to next position in target
    }
}

*targetIndex = '\0'; // terminate the (possibly shorter) string
...

// pass to new process
if( 0 == childpid )
{ // then child process
    execv(buf, parmList); // only returns if execv() failed
    perror( "execv failed" );
    exit( EXIT_FAILURE );
}

完全错误：

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.scene.layout.*;
import javafx.scene.control.*;
import javafx.scene.shape.*;
import javafx.scene.paint.*;
import javafx.geometry.*;
import java.util.*;
import javafx.scene.text.*;
public class Test extends Application
{
   public void start(Stage stage)
   {
      BorderPane pane = new BorderPane();
      HBox hBox = new HBox(10);
      boolean player1 = true;

      Label label = new Label("Player" + ((player1) ? "1" : "2") + "'s turn");
      label.setFont(Font.font(20)); 

      TextField colField = new TextField();
      colField.setPrefColumnCount(1);

      Button submit = new Button("Submit");

      hBox.getChildren().addAll(label, colField, submit);

      pane.getChildren().add(hBox);
      pane.setBottom(hBox);

      Scene scene = new Scene(pane);
      stage.setTitle("Connect 4");
      stage.setScene(scene);
      stage.show();


   }
}

Answer 1

您要将hbox添加到pane两次：一次使用pane.getChildren().add(...);，一次使用pane.setBottom(...);。这导致hbox在场景图中出现两次，给出了＃34;重复的孩子＆＃34;错误。您可能只需要pane.setBottom(...);版本。

在BorderPane中设置节点位置时出错

1 个答案: