[3234] in java-interest
Class GridBagLayout Example
daemon@ATHENA.MIT.EDU (Martin Freeman)
Fri Nov 3 22:47:55 1995
Date: Fri, 3 Nov 95 17:17:23 PST
From: martin@PRPA.Philips.COM (Martin Freeman)
To: java-interest@java.sun.com
Cc: martin@savant.PRPA.Philips.COM
I am working with the new NT version of the JDK beta 1.0. I
just tried to compile the following code that is included as an example
in the Java class GridBagLayout.java:
import java.awt.*;
import java.util.*;
import java.applet.Applet;
public class GridBagEx1 extends Applet {
protected void makebutton(String name,
GridBagLayout gridbag,
GridBagConstraints c) {
Button button = new Button(name);
gridbag.setConstraints(button, c);
add(button);
}
public void init() {
GridBagLayout gridbag = new GridBagLayout();
GridBagConstraints c = new GridBagConstraints();
setFont(new Font("Helvetica", Font.PLAIN, 14));
setLayout(gridbag);
c.fill = GridBagConstraints.BOTH;
c.weightx = 1.0;
makebutton("Button1", gridbag, c);
makebutton("Button2", gridbag, c);
makebutton("Button3", gridbag, c);
c.gridwidth = GridBagConstraints.REMAINDER; //end row
makebutton("Button4", gridbag, c);
c.weightx = 0.0; //reset to the default
makebutton("Button5", gridbag, c); //another row
c.gridwidth = GridBagConstraints.RELATIVE; //next-to-last in row
makebutton("Button6", gridbag, c);
c.gridwidth = GridBagConstraints.REMAINDER; //end row
makebutton("Button7", gridbag, c);
c.gridwidth = 1; //reset to the default
c.gridheight = 2;
c.weighty = 1.0;
makebutton("Button8", gridbag, c);
c.weighty = 0.0; //reset to the default
c.gridwidth = GridBagConstraints.REMAINDER; //end row
c.gridheight = 1; //reset to the default
makebutton("Button9", gridbag, c);
makebutton("Button10", gridbag, c);
resize(300, 100);
}
public static void main(String args[]) {
Frame f = new Frame("GridBag Layout Example");
GridBagEx1 ex1 = new GridBagEx1();
ex1.init();
f.add("Center", ex1);
f.pack();
f.resize(f.preferredSize());
f.show();
}
}
-------------------------------------------------------------------------------
I get the following error message. Before I submit a bug report, is this
error the result of something that I may be doing?
-------------------------------------------------------------------------------
java.lang.NullPointerException
at sun.tools.tree.FieldExpression.checkLHS(FieldExpression.java:166)
at sun.tools.tree.AssignExpression.checkValue(AssignExpression.java:40)
at sun.tools.tree.BinaryAssignExpression.check(BinaryAssignExpression.java:52)
at sun.tools.tree.ExpressionStatement.check(ExpressionStatement.java:43)
at sun.tools.tree.CompoundStatement.check(CompoundStatement.java:48)
at sun.tools.tree.Statement.checkMethod(Statement.java:55)
at sun.tools.javac.SourceField.check(SourceField.java:181)
at sun.tools.javac.SourceClass.check(SourceClass.java:398)
at sun.tools.javac.SourceClass.compileClass(SourceClass.java:513)
at sun.tools.javac.SourceClass.compile(SourceClass.java:500)
at sun.tools.javac.Main.compile(Main.java:195)
at sun.tools.javac.Main.main(Main.java:286)
GridBagEx1.java:7: Class GridBagConstraints not found in type declaration.
protected void makebutton(String name,
^
GridBagEx1.java:7: Class GridBagLayout not found in type declaration.
protected void makebutton(String name,
^
GridBagEx1.java:11: Class GridBagLayout not found in void makebutton(java.lang.String, GridBagLayout, GridBagConstraints).
gridbag.setConstraints(button, c);
^
GridBagEx1.java:16: Class GridBagLayout not found in type declaration.
GridBagLayout gridbag = new GridBagLayout();
^
GridBagEx1.java:16: Class GridBagLayout not found in new.
GridBagLayout gridbag = new GridBagLayout();
^
GridBagEx1.java:17: Class GridBagConstraints not found in type declaration.
GridBagConstraints c = new GridBagConstraints();
^
GridBagEx1.java:17: Class GridBagConstraints not found in new.
GridBagConstraints c = new GridBagConstraints();
^
GridBagEx1.java:20: Class GridBagLayout not found in void init().
setLayout(gridbag);
^
GridBagEx1.java:22: Class GridBagConstraints not found in void init().
c.fill = GridBagConstraints.BOTH;
^
error: An exception has occurred in the compiler; please file a bug report (java-bugs@java.sun.com).
10 errors
-
This message was sent to the java-interest mailing list
Info: send 'help' to java-interest-request@java.sun.com
