java中super和this的区别

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Java

1. super()?this()

This?,super?

Super,?

this?,.

,super(),.?,(?private)..?this?,.

super?this.?super .

2. ?public,protected,private,?

Public: ?

Private?

Protected:? ?

: ?

3. ?

* * * * *

* * * *

* * *

* *

*

public class Print {

publicstatic void main(String[] args) {

for(int i = 0; i < 5; i++) {

for(int j = 5; j > i; j--) {

System.out.print("*");

}

System.out.println();

}

}

}

4. JAVA

Java?,?

null,

5. ?JAVA

break; return ?

6. ?javajava(?)

:

SerializableimplementsSerializable(FileOutputStream)?ObjectOutputStream(?)ObjectOutputStream?writeObject(Object obj)?obj?()

7. ".java"?

public?

8. ?JAVA?

9. Overload?OverrideOverloaded

Override

Overloading

Java?

Overloaded?

1? public class Ctest(){

Public static void main(){

System.out.prinln(8+8+?88?+8+8);

}

} 168888

Overriding?Overloading?Java?Overriding?Overloading (Overriding)?(Overloading)?

Overloaded

10. Final?

?overridding

11. ,?,

:?

package test;

public class FatherClass {

public FatherClass() {

System.out.println("FatherClassCreate");

}

}

:

package test;

import test.FatherClass;

public class ChildClass extends FatherClass{

public ChildClass() {

System.out.println("ChildClassCreate");

}

public static void main(String[] args) {

FatherClass fc = new FatherClass();

ChildClass cc = new ChildClass();

}

}

C:>java test.ChildClass

FatherClass Create

FatherClass Create

ChildClass Create

12. ?

package test;

public class OuterClass {

private class InterClass {

Public Interlass(){

System.out.println("InterClassCreate");

}

}

public OuterClass(){

InterClass ic = new InterClass();

System.out.println("OuterClassCreate");

}

public static void main(String[] args){

OuterClass oc = new OuterClass();

}

}

:

C:>java test/OuterClass InterClass Create OuterClass Create

13. ?JAVA?JAVA?()?

14. COLLECTION

15.

package test;

import java.util.*;

class InsertSort {

ArrayList al;

public InsertSort(int num,int mod) {

al = new ArrayList(num);

Random rand = new Random();

System.out.println("The ArrayList SortBefore:");

for (int i=0;i<num ;i++ ){

al.add(new Integer(Math.abs(rand.nextInt())% mod + 1));

System.out.println("al["+i+"]="+al.get(i));

}

}

public void SortIt(){

Integer tempInt;

int MaxSize=1;

for(int i=1;i<al.size();i++){

tempInt = (Integer)al.remove(i);

if(tempInt.intValue()>=((Integer)al.get(MaxSize-1)).intValue()){

al.add(MaxSize,tempInt);

MaxSize++;

System.out.println(al.toString());

} else {

for (int j=0;j<MaxSize ;j++ ){

if(((Integer)al.get(j)).intValue()>=tempInt.intValue()){

al.add(j,tempInt);

MaxSize++;

System.out.println(al.toString());

break;

}

}

}

}

System.out.println("The ArrayList SortAfter:");

for(int i=0;i<al.size();i++) {

System.out.println("al["+i+"]="+al.get(i));

}

}

public static void main(String[] args) {

InsertSort is = new InsertSort(10,100);

is.SortIt();

}

}

JAVAjava.io.Serializable

CollectionComparable ? Comparator

16. "?ABC"4?"?AB"?"?ABC?DEF"?6"?ABC"?"?ABC+"?

public static void split(String source,intnum) throws Exception{

intk=0;

Stringtemp="";

for(int i = 0; i <source.length(); i++){

byte[]b=(source.charAt(i)+"").getBytes();

k=k+b.length;

if(k>num){

break;

}

temp=temp+source.charAt(i);

}

System.out.println(temp);

}

15?Java,?

public class YesterdayCurrent{

public void main(String[] args){

Calendar cal = Calendar.getInstance();

cal.add(Calendar.DATE, -1);

System.out.println(cal.getTime());

}

}

16?,?

public int getNum(){

int i = -1;

try{

String stri="";

BufferedReader in = new BufferedReader(newFileReader(f));

while((stri=in.readLine())!=null){

i = Integer.parseInt(stri.trim());

}

in.close();

}catch(Exception e){

e.printStackTrace();

}

return i;

}

public void setNum(){

int i = getNum();

i++;

try{

PrintWriter out=new PrintWriter(newBufferedWriter(new FileWriter(f,false)));

out.write(String.valueOf(i)); //?intjava?windowsString

out.close() ;

}catch(Exception e){

e.printStackTrace();

}

}

17?

class A{

static{

System.out.print("1");

}

public A(){

System.out.print("2");

}

}

class B extends A{

static{

System.out.print("a");

}

public B(){

System.out.print("b");

}

}

public class Hello{

public static void main(String[] ars){

A ab = new B(); //?,: 1a2b

ab = new B(); //?,: 1a2b2b

}

}?:static ?,()?,?,?,?

18?

(1)?implements,extends(2),?(3):publicstatic final, "friendly"()

19?

(Class)?fields?method?construtor?interface?superClass?modified?Springstruts?hibernate

20?

java.lang.Class?java.lang.refrection.Method?java.lang.refrection.Field

java.lang.refrection.Constructor?java.lang.refrection.Modifier?java.lang.refrection.Interface

21?Class?

.getClass().class?Integer.type(int) Integer.class(java.lang.Integer)?Class.forName();

22?

Class?Class?Method?method.invoke(,?)

23?Integer?Double

Integer.parseInt(?1234?) Double.parseDouble(?123.2?)

24

1+ 1.0+

25?

double d=1256.22d; d=d/100; System.out.println(Math.round(d)*100);

26

Calendar c=Calendar.getInstance();

c.set(Calendar.YEAR,2004);

c.set(Calendar.MONTH,0);

c.set(Calendar.DAY_OF_MONTH,31);

System.out.println(c.get(Calendar.YEAR)+" "+(c.get(Calendar.MONTH)+1)+" "+c.get(Calendar.DAY_OF_MONTH));

271970

Java.util.Date dat=new Date(); long now=dat.getTime();

System.currentTimeMillis()

28

-1

public static void main(String[] args){

Calendarc=Calendar.getInstance();

c.set(Calendar.YEAR,2004);

c.set(Calendar.MONTH,0);

c.set(Calendar.DAY_OF_MONTH,30);

Calendarc1=(Calendar)c.clone();

System.out.println(c.get(Calendar.YEAR)+""+(c.get(Calendar.MONTH)+1)+" "+c.get(Calendar.DAY_OF_MONTH));

c.add(Calendar.DAY_OF_MONTH,1);

if(c.get(Calendar.MONTH)!=c1.get(Calendar.MONTH)){

System.out.println("?");

}else{

System.out.println("");

}

}

29?

Import java.text. SimpleDateFormat;

SimpleDateFormat sdf=newSimpleDateFormat("yyyy-MM-dd hh:mm:ss");

Date dat=new Date();

String str=sdf.format(dat); //?

System.out.println(str);

Java.util.Date d1=sdf.parse(?yyyy-mm-dd?); //?

30?GB2312?ISO-8859-1?

String a=new String("?".getBytes("gb2312"),"iso-8859-1");

String a=new String("?".getBytes("iso-8859-1"));

String a=new String("?".getBytes("gb2312"),"iso-8859-1");

String a1=newString(a.getBytes("iso-8859-1"));

这里要说明一下，super和this的区别，this表示当前对象的指针(或叫引用)，super是一个java关键字，用于访问父类的成员和方法。所以调用的getClass()的确是父类方法，但是当前对象已经是子类了，而不是父类，你必须明白，super不代表父类对象。如果你想要得到父类对象，需要通过反射机制的到，代码如下：Classc=子类.class;c.getSuperclass().getName();这解释明白么？还有什么疑问？

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