System.out.println(\swap:circle1 =\ swap(circle1,circle2); System.out.println(\swap:circle1 = \ }
public static void swap(Circle x , Circle y){
System.out.println(\swap: x = \ y = \
Circle temp = x; x = y; y = temp;
System.out.println(\ x = \= \ } }
程序运行结果为：
11、下列程序的输出结果是什么？ public class Foo{ static int i=0; static int j=0;
public static void main(String[] args){ int i=2; int k=3; int j=3;
System.out.println(“i + j is ”+ i + j); k = i +j;
System.out.println(“k is ”+k); System.out.println(“j is ”+ j); } }
程序运行结果为：
12、运行类C的输出结果是什么？ class A{
public A(){
System.out.println(\default constructor of A y is
invoked\} }
class B extends A{ public B(){
System.out.println(\default constructor of B is invoked\ } }
public class C{
public static void main(String[] args){ B b = new B(); } }
程序运行结果为：
13、阅读下列程序写出输出结果: class A{
String s=\ void show(){
System.out.println(s); } }
class B extends A{
String s=\
void show() {
System.out.println(s); } }
public class TypeConvert{
public static void main(String args[]){ B b1;
B b2=new B();
A a1,a2; a1=(A)b2; a2=b2;
System.out.println(a1.s); a1.show();
System.out.println(a2.s); a2.show(); b1=(B)a1;
System.out.println(b1.s); b1.show();
System.out.println(b2.s); b2.show(); } }
程序运行结果为：
14、阅读下列程序，写出程序运行的结果： class A { int i, j;
public A(){ this.i=0; this.j=0; }
public void print(){ System.out.println (\}
class B extends A{ int m;
public B (int i, int j, int m){ super (); this.m=m; }
public void print (){System.out.println (\ m=\}
public class C{
public static void main(String args[]){ A a=new A();
B b=new B(1, 2, 3); a.print (); b.print (); } }}
程序运行结果为：
15、阅读下列程序，写出程序运行的结果： class Demo { public void test ()
{System.out.println (\public void test (int i) {System.out.println (i);} public void test (int a, int b) {System.out.println (a+b);} }
public class Test {
public static void main(String args[]){ Demo de=new Demo(); de.test(); de.test(5); de.test(6,8); } }
程序运行结果为：
16、阅读下列程序，写出程序运行的结果： class Cube{ int width; int height; int depth;
Cube(int x,int y,int z){ this.width=x; this.height=y; this.depth=z; }
public int vol(){
return width*height*depth;}} public class UseCube {
public static void main(String[] args) { Cube a=new Cube(3,4,5);
System.out.println(\长度=\ System.out.println(\体积=\ } }