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U

union(GRectangle) - Method in class acm.graphics.GRectangle
Returns the smallest rectangle that contains both r1 and r2.
UNIX - Static variable in class acm.util.Platform
Indicates that the system is some variety of Unix or Linux.
UNKNOWN - Static variable in class acm.util.Platform
Indicates that the type of system cannot be determined.
update(Graphics) - Method in class acm.graphics.GCanvas
Updates the canvas.
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