Question

这是片段：

JPanel logoPanel=new JPanel();
GroupLayout logoLayout=new GroupLayout(logoPanel);
logoPanel.setLayout(logoLayout);
logoPanel.setHorizontalGroup((GroupLayout.Alignment.BASELINE).addGap(100,100));
logoPanel.setVerticalGroup((GroupLayout.Alignment.BASELINE).addGap(100,100));

这些是cmd上产生的错误：

MainPageTypo.java:27: cannot find symbol
logoPanel.setHorizontalGroup((GroupLayout.Alignment.BASELINE).addGap(100,100));
                                                            ^
symbol:   method addGap(int,int)
location: class Alignment
MainPageTypo.java:28: cannot find symbol
logoPanel.setVerticalGroup((GroupLayout.Alignment.BASELINE).addGap(100,100));
                                                          ^
symbol:   method addGap(int,int)
location: class Alignment
2 errors

为什么会出现这些错误，我该如何解决？

Answer 1

根据JavaDoc GroupLayout.Group只有方法addGap(int)和addGap(int, int, int)，因此您要么缺少一个参数，要么过多。

addGap(100)因此就足够了。

编辑2：

您在addGap(...)上调用GroupLayout.Alignment这是一个枚举，根本不提供该方法：第28行包含(GroupLayout.Alignment.BASELINE).addGap(100,100)

我想您要致电logoLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)或logoLayout.createSequentialGroup()来创建群组。

您还在JPanel上调用setHorizontalGroup(...)（和setVerticalGroup(...)），而不是在也应该生成错误的GroupLayout上调用。将其更改为logoLayout.setHorizontalGroup( ... );。

编辑：对消息含义的简短提示

symbol:   method addGap(int,int)   //the symbol that is searched for
location: class Alignment   //the symbol (method) is searched in class Alignment or its class hierarchy
MainPageTypo.java:28: cannot find symbol  //the compiler cant find the symbol stated above which is used at line 28 in file MainPageTypo.java 
logoPanel.setVerticalGroup((GroupLayout.Alignment.BASELINE).addGap(100,100)); // this is the content of line 28

Answer 2

我建议您也将代码段更正为正确的表单，该表单位于您提供的代码中。

从我看到你得到的结果：

IllegalStateException: Baseline must be used along vertical axis

这意味着无法在基线上创建第一个并行组，例如更改它领先。它编译。</ p>

GroupLayout.Group中的addGap（int）问题

2 个答案: