一些API：

• int gridx, gridy：指定單元格的起始行和列。默認值為 0。
• int gridwidth, gridheight：指定單元格的行和列的范圍。默認值為 1。
• double weightx, weighty：指定單元格擴大的容量。默認值為 0。
• int anchor：表示組件在單元格內的對其方式。可以選擇的絕對位置包括：

NORTHWEST	NORTH	NORTHEAST
WEST	CENTER	EAST
SOUTHWEST	SOUTH	SOUTHEAST

相對位置：

FIRST_LINE_START	LINE_START	FIRST_LINE_END
PAGE_START	CENTER	PAGE_END
LAST_LINE_START	LINE_END	LAST_LINE_END

如果你的應用要本地化為從右向左或者從上向下排列文本，就應該使用后者。默認值為 CENTER。

• int fill：指定組件在單元格內的填充行為，取值為 NONE、BOTH、HORIZONTAL 或者 VERTICAL。默認值為 NONE。
• int ipadx, ipady：指定組件周圍的“內部”填充。默認值為 0。
• Insets insets：指定組件邊框周圍的“外部”填充。默認為不填充。
• GridBagConstraints(int gridx, int gridy, int gridwidth, int gridheight, double weightx, double weighty, int anchor, int fill, Insets insets, int ipadx, int ipady)：用參數中給定的所有字段值構造 GridBagConstraints。這個構造器只用于自動代碼生成器，因為它會讓你的源代碼很難閱讀。

package gridbag;import java.awt.*;/*** This class simplifies the use of the GridBagConstraints class.* @version 1.01 2004-05-06* @author Cay Horstmann*/ public class GBC extends GridBagConstraints {/*** Constructs a GBC with a given gridx and gridy position and all other grid* bag constraint values set to the default.* @param gridx the gridx position* @param gridy the gridy position*/public GBC(int gridx, int gridy){this.gridx = gridx;this.gridy = gridy;}/*** Constructs a GBC with given gridx, gridy, gridwidth, gridheight and all* other grid bag constraint values set to the default.* @param gridx the gridx position* @param gridy the gridy position* @param gridwidth the cell span in x-direction* @param gridheight the cell span in y-direction*/public GBC(int gridx, int gridy, int gridwidth, int gridheight){this.gridx = gridx;this.gridy = gridy;this.gridwidth = gridwidth;this.gridheight = gridheight;}/*** Sets the anchor.* @param anchor the anchor value* @return this object for further modification*/public GBC setAnchor(int anchor){this.anchor = anchor;return this;}/*** Sets the fill direction.* @param fill the fill direction* @return this object for further modification*/public GBC setFill(int fill){this.fill = fill;return this;}/*** Sets the cell weights.* @param weightx the cell weight in x-direction* @param weighty the cell weight in y-direction* @return this object for further modification*/public GBC setWeight(double weightx, double weighty){this.weightx = weightx;this.weighty = weighty;return this;}/*** Sets the insets of this cell.* @param distance the spacing to use in all directions* @return this object for further modification*/public GBC setInsets(int distance){this.insets = new Insets(distance, distance, distance, distance);return this;}/*** Sets the insets of this cell.* @param top the spacing to use on top* @param left the spacing to use to the left* @param bottom the spacing to use on the bottom* @param right the spacing to use to the right* @return this object for further modification*/public GBC setInsets(int top, int left, int bottom, int right){this.insets = new Insets(top, left, bottom, right);return this;}/*** Sets the internal padding* @param ipadx the internal padding in x-direction* @param ipady the internal padding in y-direction* @return this object for further modification*/public GBC setIpad(int ipadx, int ipady){this.ipadx = ipadx;this.ipady = ipady;return this;} }

總結

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