class Parent{ //创建父类 Parent(){ System.out.println("调用父类的parent()构造方法"); } } class SubParent extends Parent{ //继承父类 SubParent(){ System.out.println("调用子类的SubParent()构造

public class 方法重载 { public static int add(int a, int b){ return a + b ; } public static double add(double a , double b){ return a + b; } public static int add(int a){ return 9; } public s

public class 多态 { private 多态[] qtest = new 多态[6]; private int nextIndex = 0; public void draw(多态 q){ if (nextIndex<qtest.length){ qtest[nextIndex] = q; System.out.println(nextIndex); nex