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TheymovedtoBeijing___.
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Hebegantoworkthere____.
Hewasdoingsomewashing____.
编写空白处代码，使得程序运行输出为：boy dancegirl jumpboy dance程序源代码为：public class Test {public static void main(String[] args) {King king = new1();king.babyAct(new Boy());king.babyAct( 2 );king.babyAct(new Boy());}}class King{void babyAct( 4 baby){baby.activity();}}interface Baby {void 3();}class Boy implements Baby {public void activity() {System.out.println("boy dance");}}class Girl implements Baby {public void activity() {System.out.println("girl jump");}}
先对问题进行调查,然后从功能和流程的角度来分析、了解和优化问题,最后规划和实现系统的开发方法是( )。
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