第13章 字符串
#本不想记录这一章的内容，但为了连贯性，列出不太熟悉的几个点#
13.5 格式化输出
printf和format的用法
1 import static java.lang.System.out; 2 public class Test { 3 public static void main(String args[]){ 4 out.printf("%s, %f, %d\n", "abc", 5.4, 3); 5 out.format("%s, %f, %d", "abc", 5.4, 3); 6 } 7 }/*Output: 8 abc, 5.400000, 3 9 abc, 5.400000, 3 10 */
Formatter类的用法
1 import static java.lang.System.out; 2 import java.util.*; 3 public class Test { 4 public static void main(String args[]){ 5 Formatter f = new Formatter(out); 6 f.format("01234567890123456789012345678901\n"); 7 f.format("%-15s,%-5d,%10b\n", "abcdef", 123, false); 8 } 9 }/*Output: 10 01234567890123456789012345678901 11 abcdef ,123 , false 12 */
String.format()的用法
1 import static java.lang.System.out; 2 public class Test { 3 public static String format(byte[] data) { 4 StringBuilder result = new StringBuilder(); 5 int n = 0; 6 for(byte b: data){ 7 if( n % 16 == 0) 8 result.append(String.format("%05X: ", n)); 9 result.append(String.format("%2X ", b)); 10 n++; 11 if(n % 16 == 0) 12 result.append("\n"); 13 } 14 result.append("\n"); 15 return result.toString(); 16 } 17 public static void main(String args[]){ 18 out.print(Test.format(new byte[] {12,33,16,23,3,44,50,2,1,24,3,5,9,2,54,5,13,4,15,1,2,3,4,2,3,15,6,2,6,2,4,3,5,3,5,3,4,5})); 19 } 20 }/*Output: 21 00000: C 21 10 17 3 2C 32 2 1 18 3 5 9 2 36 5 22 00010: D 4 F 1 2 3 4 2 3 F 6 2 6 2 4 3 23 00020: 5 3 5 3 4 5 24 */
#关于Rex，预留空地#
