java鏈熸湯鑰冭瘯棰?- 鐧惧害鏂囧簱

{ public static void main(String args[])

{ new FrameOut(); }

}

class FrameOut extends Frame // Frame为系统定

{ Button btn; // FrameOut( )

{ super(\按钮\

btn = new Button(\按下我\

setLayout(new FlowLayout( ));

add(btn);

setSize(300,200);

show( );

}

}

4、import java.io.*;

public class abc

义的窗框类

{ public static void main(String args[])

{ SubClass sb = new SubClass( );

}

}

class SuperClass

{ int a = 10 , b = 20 ; }

class SubClass extends SuperClass

{ int max( ) { return ((a>b)?a:b); } }

四、写出下面程序的运行结果(每小题10分，共30分)

1、 import java.io.*;

public class abc

{ public static void main(String args[ ])

{ AB s = new AB(\

}

}

class AB {

String s1;

String s2;

AB( String str1 , String str2 )

{ s1 = str1; s2 = str2; }

public String toString( )

{ return s1+s2;}

}

2、 import java.io.* ;

public class abc

{

public static void main(String args[ ])

{ int i , s = 0 ;

int a[ ] = { 10 , 20 , 30 , 40 , 50 , 60 , 70 , 80 , 90 };

for ( i = 0 ; i < a.length ; i ++ )

if ( a[i]%3 = = 0 ) s += a[i] ;

}

}

3、import java.io.* ;

public class abc

{

public static void main(String args[ ])

)

}

class SubClass extends SuperClass

{ int c;

SubClass(int aa,int bb,int cc)

{ super(aa,bb);

c=cc;

}

}

class SubSubClass extends SubClass

{ int a;