1.implements PCI是實(shí)現(xiàn)PCI 接口的意思;
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2.不是;這兩個(gè)方法是必須寫的,不能少;這兩個(gè)方法來自接口中的,既然現(xiàn)實(shí)了PCI接口,就一定要實(shí)現(xiàn)接口中的所有方法
3.PCI nc= new NetworkCard(); 因?yàn)镹etworkCard實(shí)現(xiàn)了PCI接口,PCI就類似是NetworkCard的父類,這個(gè)體現(xiàn)了面相對象編程中的多態(tài);就好比你是一個(gè)男生,我可以說你是一個(gè)人吧,意思是一樣的;
4.PCI nc = new PCI()這個(gè)是不能直接這樣寫的,因?yàn)镻CI是接口,接口中沒有構(gòu)造方法,這個(gè)是new不出來對象的
public class Admins implements Userinterface{
private String name;
private String password;
private static int userNum;
public Admins() {
userNum ++;
}
public Admins(String name, String password) {
this.name = name;
this.password = password;
userNum ++;
}
public void setPassword(String password) {
this.password = password;
}
public String getPassword() {
return this.password;
}
public String toString() {
return "Total: " + Admins.userNum + "\nName: " + this.name + "\nPassword: " + this.password;
}
public static void main(String [] args) {
Userinterface [] users = new Userinterface[]{new Admins("jeryy", "11111"), new Admins("green", "123123")};
for(Userinterface u: users) {
System.out.println(u);
}
}
}
interface Userinterface{
public void setPassword(String password);
public String getPassword();
public String toString();
}
public class Bins{
public static void main(String [] args) {
int len = 10;
int [] dist = new int [len];
for(int i = 0; i dist.length; i ++) {
dist[i] = (int)(Math.random() * 100);
}
java.util.Arrays.sort(dist);
System.out.println("生成數(shù)組如下: ");
for(int i: dist) {
System.out.print(i + "\t");
}
java.util.Scanner san = new java.util.Scanner(System.in);
System.out.print("輸入要查找的數(shù): ");
int key = san.nextInt();
int res = Bins.binSearch(dist, key);
//System.out.println(res);
String info = (res =0 ) ? (key + ":" + res) : "查找失敗";
System.out.println(info);
}
public static int binSearch(int [] dist, int key) {
java.util.Arrays.sort(dist);
return java.util.Arrays.binarySearch(dist, key);
}
}
interface l1 { abstract void test(int i); } interface l2 { abstract void test(String s); } public class jiekou implements l1,l2 { public void test(int i) { System.out.println("接口1"); } public void test(String s) { System.out.println("接口2"); } public static void main(String args[]) { jiekou t=new jiekou(); t.test(42); t.test("Hello"); } } 下一個(gè)是內(nèi)部接口 public class groupsix { public interface student_info { public void out(); } public class student implements student_info { int count; String name; public student(String n1) { name=n1; count++; } public void out() { System.out.println(this.name+" count="+this.count); } } public groupsix(String name1[]) { student s1; int i=0; while(iname1.length) { s1=new student(name1[i]); s1.out(); i++; } } public static void main(String args[]) { String arr[]={"A","B","C"}; groupsix g6; new groupsix(arr); } }
當(dāng)前題目:完整的java接口代碼 java接口代碼實(shí)例
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