程序如下： ∥Java_2. java import java. awt. *; import java. awt. event. * ; ∥********** Found ********** public class Java_2 (5) Frame implements ActionListener public static void main( String args[ ]) Java_2 fr=new Java_2("Hello!"); fr. setLayout(new FlowLayout( )); fr. setSize (200,100); fr. setBackground(Color. blue); Button b=new Button("确定"); ∥********** Found ********** b. ( 6 ) (new Java._2( )); fr..add(b); fr. setVisible (true); public void actionPerformed( ActionEvent e) System. exit(0); public Java_2(String str) super(str); public Java_2( )

题库:计算机等级考试 类型:简答题 时间:2021-06-06 13:50:39 免费下载:《相同项多选集》Word试卷

程序如下： ∥Java_2. java import java. awt. *; import java. awt. event. * ; ∥********** Found ********** public class Java_2 (5) Frame implements ActionListener public static void main( String args[ ]) Java_2 fr=new Java_2("Hello!"); fr. setLayout(new FlowLayout( )); fr. setSize (200,100); fr. setBackground(Color. blue); Button b=new Button("确定"); ∥********** Found ********** b. ( 6 ) (new Java._2( )); fr..add(b); fr. setVisible (true); public void actionPerformed( ActionEvent e) System. exit(0); public Java_2(String str) super(str); public Java_2( )

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