Java实验用接口实现求三角形，圆形，矩形的面积和周长

[{"title":"（13个子文件393KB）Java实验用接口实现求三角形，圆形，矩形的面积和周长","children":[{"title":"Py015S1_2","children":[{"title":".project <span style='color:#111;'>384B</span>","children":null,"spread":false},{"title":"exp015S1_2","children":[{"title":"Triangle.java <span style='color:#111;'>499B</span>","children":null,"spread":false},{"title":"Circle.class <span style='color:#111;'>878B</span>","children":null,"spread":false},{"title":"Rectangle.java <span style='color:#111;'>449B</span>","children":null,"spread":false},{"title":"Graphics.class <span style='color:#111;'>149B</span>","children":null,"spread":false},{"title":"Rectangle.class <span style='color:#111;'>916B</span>","children":null,"spread":false},{"title":"Circle.java <span style='color:#111;'>547B</span>","children":null,"spread":false},{"title":"Triangle.class <span style='color:#111;'>1.03KB</span>","children":null,"spread":false},{"title":"Graphics.java <span style='color:#111;'>199B</span>","children":null,"spread":false},{"title":"J08W015.java <span style='color:#111;'>5.57KB</span>","children":null,"spread":false},{"title":"J08W015.class <span style='color:#111;'>3.89KB</span>","children":null,"spread":false}],"spread":true},{"title":"J08yS1_2.doc <span style='color:#111;'>482.50KB</span>","children":null,"spread":false},{"title":".classpath <span style='color:#111;'>226B</span>","children":null,"spread":false}],"spread":true}],"spread":true}]