GroupLayout给出了java swing的错误

Question

我得到了很多错误.任何人都可以向我建议我哪里出错了GroupLayout.

layout.setHorizontalGroup(
    layout.createSequentialGroup()
        .addComponent(new JLabel("Enter Book Name"))
        .addComponent(new JTextField("TextField", 20))
);

错误:

    Exception in thread "main" java.lang.IllegalStateException:
        javax.swing.JTextField[,0,0,0x0,invalid,layout=javax.swing.
            plaf.basic.BasicTextUI$UpdateHandler,alignmentX=0.0,
            alignmentY=0.0,border=javax.swing.plaf.BorderUIResource$
            CompoundBorderUIResource@3d0bbf9e,flags=296,maximumSize=,
            minimumSize=,preferredSize=,caretColor=sun.swing.
            PrintColorUIResource[r=51,g=51,b=51],disabledTextColor=javax
            .swing.plaf.ColorUIResource[r=184,g=207,b=229],editable=true
            ,margin=javax.swing.plaf.InsetsUIResource[top=0,left=0,
            bottom=0,right=0],selectedTextColor=sun.swing.
            PrintColorUIResource[r=51,g=51,b=51],selectionColor=javax.
            swing.plaf.ColorUIResource[r=184,g=207,b=229],columns=20,
            columnWidth=0,command=,horizontalAlignment=LEADING]
            is not attached to a vertical group
            at javax.swing.GroupLayout.checkComponents(Unknown Source)
            at javax.swing.GroupLayout.prepare(Unknown Source)

Answer 1

使用GroupLayout时,必须指定"水平"和"垂直"布局.每个组件必须在每个组中指定一次.不这样做会导致此错误.

此外,请确保正确地交叉填充每个项目.如果你正在制作网格,请确保两个方向都是平行序列,反之亦然.如果要制作一行按钮或其他东西,请确保它们是单向并行顺序.