import java.util.*; public class RandomChars {
private static Random rand = new Random();
public char next() {
return (char)rand.nextInt(128);
} public static void main(String[] args) {
RandomChars rc = new RandomChars();
for(int i = 0; i < 10; i++);
System.out.print(rc.next() + " ");
}
}import java.nio.*;
import java.util.*;public class AdaptedRandomChars16 extends RandomChars implements Readable{
private int count;
public AdaptedRandomChars16(int count) {
this.count = count;
}
public int read(CharBuffer cb) {
if(count-- == 0)
return -1;
String result = Character.toString(next()) + " ";
cb.append(result);
return result.length();
}
public static void main(String[] args) {
Scanner s = new Scanner(new AdaptedRandomChars16(10));
while(s.hasNext())
System.out.print(s.next() + " ");
}
}代码是这样的,上面的是父类,下面的是子类,子类的,String result = Character.toString(next()) + " ";
这句话,我哪都找不到Character,虽然DEBUG这句话时候转到父类的return (char)rand.nextInt(128); 但还是有点不大明白。希望指点。
private static Random rand = new Random();
public char next() {
return (char)rand.nextInt(128);
} public static void main(String[] args) {
RandomChars rc = new RandomChars();
for(int i = 0; i < 10; i++);
System.out.print(rc.next() + " ");
}
}import java.nio.*;
import java.util.*;public class AdaptedRandomChars16 extends RandomChars implements Readable{
private int count;
public AdaptedRandomChars16(int count) {
this.count = count;
}
public int read(CharBuffer cb) {
if(count-- == 0)
return -1;
String result = Character.toString(next()) + " ";
cb.append(result);
return result.length();
}
public static void main(String[] args) {
Scanner s = new Scanner(new AdaptedRandomChars16(10));
while(s.hasNext())
System.out.print(s.next() + " ");
}
}代码是这样的,上面的是父类,下面的是子类,子类的,String result = Character.toString(next()) + " ";
这句话,我哪都找不到Character,虽然DEBUG这句话时候转到父类的return (char)rand.nextInt(128); 但还是有点不大明白。希望指点。
toString是该类的一个静态方法,这种方法比较特别,不需要用实例来调用,可直接用类名来调用。
一些实用类里的方法基本都是静态方法,如常用的Integer.parseInt之类的方法。
static String toString(char c)
返回一个表示指定 char 值的 String 对象。
Character只是一个java.lang里的包的一个FINAL类而已,可以把他当作一个工具类就成了