4.1 Supply contracts (in the form of comments specifying
pre- and post conditions)
for the enqueue() method of the LinkedQueue class given in
the Appendix.
(2)
4.2 Let Thing be a class which is capable of cloning
objects, and consider the code
fragment:
Thing thing1 = new Thing(); //(1)
Thing thing2 = thing1; //(2)
Thing thing3 = (Thing) thing1.clone(); //(3)
Explain how the objects thing2 and thing3 differ from each
other after
execution of the statements.
(
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Answer / Jayanti Chouhan
```javan// Text interfacenpublic interface Text {n void draw(Graphics g);n}nn// PlainText classnpublic class PlainText implements Text {n private Font font;n private Color color;n private String text;n public PlainText(Font f, Color c, String t) {n font = f;n color = c;n text = t;n }n public void draw(Graphics g) {n g.setColor(color);n g.setFont(font);n g.drawString(text, 20, 20);n }n}n```java
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