学习 java langspec-3.0. 规范后的代码
2008-07-31 19:46
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package com;
public interface gg {
public void ss();
}
package com;
public abstract class tt {
public void ss()
{
}
}
package com;
public class ww extends tt implements gg {
}
[code]package com;
public class ww {
static ww w=new ww();
static
{
System.out.println("初始化");
}
public ww()
{
System.out.println("构造函数");
}
}
package com.test;
import com.ww;
public class Client {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
new ww();
}
}
[code]package com;
public class ww {
public interface aa {
void dd();
}
}
package com.test;
import com.ww;
public class Client implements ww.aa {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
}
public void dd() {
// TODO Auto-generated method stub
}
}
[code]package com;
public class ww {
public ww()
{
}
protected static void ss()
{
}
interface aa
{
void dd();
}
public static class ss implements aa
{
public void dd() {
// TODO Auto-generated method stub
}
}
}
package com;
public class Client {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
ww.ss s =new ww.ss();
}
}
[code]package com;
public class ww {
public ww()
{
}
protected static void ss()
{
}
interface aa
{
void dd();
}
public class ss implements aa
{
public void dd() {
// TODO Auto-generated method stub
}
}
}
package com;
public class Client {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
ww w = new ww();
ww.ss s = w.new ss();
}
}
[code]package com;
public class ww {
{
System.out.println("初始化");
}
public ww()
{
System.out.println("构造函数");
}
}
package com.test;
import com.ww;
public class Client {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
new ww();
}
}
[code]package com;
public abstract class ww {
static {
System.out.println("类初始化");
}
{
System.out.println("实例初始化");
}
public static void ss() {
System.out.println("我是一个抽象类的静态方法");
}
public ww() {
System.out.println("构造函数");
}
}
package com.test;
import com.ww;
public class Client {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
ww.ss();
}
}
[code]泛型的使用
package com;
public class WW<T> {
T t;
public T getT() {
return t;
}
public void setT(T t) {
this.t = t;
}
public T print() {
System.out.println(t.toString());
return t;
}
public static void main(String[] args) {
WW<String> w = new WW<String>();
w.setT("sss");
w.print();
}
}
package com.org;
public interface gg<T>{
public
void ss(T t);
}
package com;
import com.org.gg;
public class WW<T> implements gg<T> {
public void ss(T t) {
}
public static void main(String[] args) {
}
}
package com.test2;
public class TT {
public TT(String s)
{
System.out.println("super Constructor");
}
}
package com;
import com.test2.TT;
public class WW extends TT {
public WW(String s) {
super(s);
// TODO Auto-generated constructor stub
}
public static void main(String[] args) {
new WW("sss");
}
}
package com.test2;
public class TT {
public TT()
{
System.out.println("super Constructor");
}
}
package com;
import com.test2.TT;
public class WW extends TT {
public static void main(String[] args) {
new WW();
}
}
package com.test2;
public class TT {
static {
System.out.println("super static Initializer");
}
}
package com;
import com.test2.TT;
public class WW extends TT {
public static void main(String[] args) {
new WW();
}
}
package com.test2;
public class tt {
public void m1() {
m2();
}
public void m2() {
System.out.println("super m2");
};
}
package com;
import com.test2.tt;
public class WW extends tt {
public static void main(String[] args) {
new WW().m1();
}
public void m2() {
System.out.println("sub m2");
}
}
package com.test2;
public abstract class tt {
{
System.out.println("sss");
}
public void set()
{
}
}
package com;
import com.test2.tt;
public class WW extends tt {
public static void main(String[] args) {
new WW();
}
}
package com;
public class WW {
int s = gets();
public int gets() {
System.out.println("gets");
return 10;
}
public static void main(String[] args) {
new WW();
}
}
package com.org;
public interface gg {
public int s = 100000;
}
package com.test2;
public class TT {
public String s="100";
}
package com;
import com.org.gg;
import com.test2.TT;
public class WW extends TT implements gg {
public int s = 10;
public static void main(String[] args) {
WW w = new WW();
TT t = w;
gg g = w;
System.out.println(t.s);
System.out.println(w.s);
System.out.println(g.s);
}
}
下面的程序为什么在编译时报错呢？
package com.org;
public interface gg {
public int s = 100000;
}
package com.test2;
public class TT {
public String s="100";
}
package com;
import com.org.gg;
import com.test2.TT;
public class WW extends TT implements gg {
public void s()
{
System.out.println(s);
}
}
package com.test2;
public class TT {
public int s=100;
}
package com;
import com.test2.TT;
public class WW extends TT {
public int s = 10;
public static void main(String[] args) {
TT t = new WW();
WW w = new WW();
System.out.println(t.s);
System.out.println(w.s);
}
}
import static的使用：
package com.org;
public interface gg {
int s = 100000;
}
package com;
import static com.org.gg.s;
public class WW {
public void s() {
System.out.println(s);
}
public static void main(String[] args) {
new WW().s();
}
}
package com.test2;
public class TT {
public void ss(){
System.out.println("super");
}
}
package com;
import com.test2.TT;
public class WW extends TT {
public static void main(String[] args) {
WW w=new WW();
w.ss();
TT t=w;
t.ss();
}
public void ss(){
System.out.println("sub");
}
}
下面的这段代码编译出错
package com.test2;
public class TT {
public void ss(){
System.out.println("super");
}
}
package com;
import com.test2.TT;
public class WW extends TT {
public static void main(String[] args) {
}
protected void ss() {
System.out.println("sub");
}
}
那下面的程序的输出会是什么呢？
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