1ï¼ä»ä¹æ¯superï¼ä»ä¹æ¯thisï¼
superå
³é®å表示è¶
ï¼ç¶ï¼ç±»çææãthisåé代表对象æ¬èº«ã
2ï¼ä½¿ç¨super&thisè°ç¨æååéåæ¹æ³
å¯ä»¥ä½¿ç¨super访é®ç¶ç±»è¢«åç±»éèçåéæè¦ççæ¹æ³ãå½åç±»å¦ææ¯ä»è¶
类继æ¿èæ¥çï¼å½è°ç¨super.XX()å°±æ¯è°ç¨åºç±»çæ¬çXXï¼ï¼æ¹æ³ãè§ç¤ºä¾1ã
å½ç±»ä¸æ两个åååéï¼ä¸ä¸ªå±äºç±»ï¼ç±»çæååéï¼ï¼èå¦ä¸ä¸ªå±äºæ个ç¹å®çæ¹æ³ï¼æ¹æ³ä¸çå±é¨åéï¼ï¼ä½¿ç¨thisåºåæååéåå±é¨åéãè§ç¤ºä¾2ã
示ä¾1
class Person {
protected void print() {
System.out.println("The print() in class Person.");
}
}
public class DemoSuper extends Person {
public void print() {
System.out.println("The print() in class DemoSuper.");
super.print();// è°ç¨ç¶ç±»çæ¹æ³
}
public static void main(String[] args) {
DemoSuper ds = new DemoSuper();
ds.print();
}
}
ç»æï¼
The print() in class DemoSuper.
The print() in class Person.
示ä¾2
public class DemoThis {
private String name;
public void setName(String name) {
this.name = name;// åä¸ä¸ªnameæ¯private nameï¼åä¸ä¸ªnameæ¯setNameä¸çåæ°ã
}
}
3ï¼ä½¿ç¨this表示å½åè°ç¨æ¹æ³ç对象å¼ç¨
åè®¾ä½ å¸æå¨æ¹æ³çå
é¨è·å¾å¯¹å½å对象çå¼ç¨ï¼å¯ä½¿ç¨å
³é®åthisãthiså
³é®ååªè½å¨æ¹æ³å
é¨ä½¿ç¨ï¼è¡¨ç¤ºå¯¹âè°ç¨æ¹æ³çé£ä¸ªå¯¹è±¡âçå¼ç¨ãè§ç¤ºä¾3ã
示ä¾3
Button bn;
â¦
bn.addActionListener(this);
4ï¼ä½¿ç¨super&thisè°ç¨æé å
superï¼åæ°ï¼ï¼è°ç¨åºç±»ä¸çæä¸ä¸ªæé å½æ°ï¼åºè¯¥ä¸ºæé å½æ°ä¸ç第ä¸æ¡è¯å¥ï¼ãè§ç¤ºä¾4ã
thisï¼åæ°ï¼ï¼è°ç¨æ¬ç±»ä¸å¦ä¸ç§å½¢æçæé å½æ°ï¼åºè¯¥ä¸ºæé å½æ°ä¸ç第ä¸æ¡è¯å¥ï¼ã è§ç¤ºä¾5ã
示ä¾4
class Person {
public static void prt(String s) {
System.out.println(s);
}
Person() {
prt("A Person.");
}
Person(String name) {
prt("A person name is:" + name);
}
}
public class Chinese extends Person {
Chinese() {
super();// è°ç¨ç¶ç±»æé å½æ°ã
prt("A chinese.");
}
Chinese(String name) {
super(name);// è°ç¨ç¶ç±»å
·æç¸åå½¢åçæé å½æ°ã
prt("his name is:" + name);
}
public static void main(String[] args) {
Chinese cn = new Chinese();
cn = new Chinese("kevin");
}
}
ç»æï¼
A Person.
A chinese.
A person name is:kevin
his name is:kevin
示ä¾5
Point(int a,int b){
x=a;
y=b;
}
Point(){
this(1,1); //è°ç¨point(1,1),å¿
é¡»æ¯ç¬¬ä¸æ¡è¯å¥ã
}
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2ï¼super()åthis()类似,åºå«æ¯ï¼superä»åç±»ä¸è°ç¨ç¶ç±»çæé æ¹æ³ï¼this()å¨åä¸ç±»å
è°ç¨å
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6ï¼this()åsuper()é½æçæ¯å¯¹è±¡ï¼æ以ï¼åä¸å¯ä»¥å¨staticç¯å¢ä¸ä½¿ç¨ãå
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