我有一个以前工作得很好的老项目,但今天我打开它,发现编译器告诉我'cannot find symbol Integer.valueOf(int)'或'cannot find symbol Integer.toHexString(int)'。SuppressWarnings("unchecked")
List numbers = new ArrayList(Arrays.asList(1, 2, 3)); // cannot find In
import java.awt.Color;import java.awt.Graphics2D;import java.awt.Rectangle;import javax.swing.JComponent;
* object of class myComponent provide a "canvas" to record your art work. * @author