Java string processing

Java string processing
I just learned that the comments are not fully explained. You may also be welcomed to discuss them with me. A Chinese cabbage, and package Class. string; import java. util. tests;/*** String test * @ author Administrator **/public class StringTest {public static void main (String [] args) {internal input = new partition (System. in); // define two default strings: String entry = "aBcDa"; String entry1 = "1, 2, 4, 1"; System. out. println ("********************"); System. out. println ("the first string defaults to:" + entry + "\ n the second string defaults to:" + entry1); System. out. println ("********************"); int seat = entry. indexOf ("c"); // locate the position of c. If no seat value is set, the value is negative. out. println ("\ n" + entry + "starting from 0" c "in" + seat + "bit \ n"); System. out. println (entry + "Total" + entry. length () + "characters"); // length () returns the String length String x = entry. toLowerCase (); // toLowerCase () to lowercase String d = entry. toUpperCase (); // toUpperCase () is converted to uppercase System. out. println ("\ n lower case:" + x + "\ n upper case:" + d); String a1 = "abcda "; // The input d and a1 are case-insensitive. boolean a = entry. when signorecase (a1); // if case-insensitive a is ignored, true then signorecase () ignores case-insensitive if (a) System. out. println ("\ n password is" + entry + "case-insensitive"); String add = entry + entry1; // method 1 String add1 = entry1.concat (entry ); // method 2 System. out. println ("\ n two string connections: method 1" + add + "method 2" + add1); int appear = entry1.indexOf ("1 "); // locate int appear1 = entry1.lastIndexOf ("1") at the first 1 in 12341; // locate int appear2 = entry in the last 1 in 12341. indexOf (97); // The location of B. The ASCII code of B is 98 int appear3 = entry. lastIndexOf (97); // location of B. The ASCII code of B is 98 System. out. println ("\ n starts from 0" + entry1 + "position of the first 1:" + appear + "\ t position of the last 1" + appear1 ); system. out. println ("\ n starts from 0" + entry + "the first location of a:" + appear2 + "\ t the last location of a" + appear3 ); string extract = entry. substring (2); // abcda truncates String extract1 = entry from the second position. substring (1, 4); // abcda intercepts System from the second place. out. println ("\ n" + entry + "starts from 0. The second digit (included) is used to extract all the subsequent content and obtain:" + extract); System. out. println ("\ n" + entry + "specifies the range to intercept, from 0 to the first (inclusive) to the fourth (excluded):" + extract1 ); string out = entry1.trim (); // remove the space System. out. println ("\ n Space removal operation" + entry1 + "output after space removal:" + out); String split [] = out. split (","); // use "," as the shard flag to save the shard content to the split array System. out. println ("\ n uses", "as the shard flag, after splitting"); int j = 0; for (int I = 0; I <split. length; I ++) {System. out. println ("\ n" + (I + 1) + ":" + split [I]); j ++;} System. out. println ("\ n split into" + j + "characters stored in string array"); // StringBuffer test StringBuffer sb = new StringBuffer ("\ n hello "); // create, the initial value is Hello int num = 112; StringBuffer sb1 = sb. append ("I'm fine"); // Add System for the first time. out. println (sb1); StringBuffer sb2 = sb1.append ("ah"); // added for the second time. A single character can be String or char System. out. println (sb2); StringBuffer sb3 = sb2.append (num); // Add System for the third time. out. println (sb3); String B = "helloword. java "; // create the string System. out. println ("\ n ******************"); System. out. println ("a default string:" + B); System. out. println ("*******************"); System. out. println ("\ n before replacement:" + B); B = B. replace ("ll", "EE"); // replace "ll" with "EE" System. out. println ("after replacement:" + B); System. out. println ("\ n" + B + "whether to use. end of jav: "+ B. endsWith (". jav "); // determines if it is ". the end of jav is obviously ". java "ends with false System. out. println (B + "whether to start with h:" + B. startsWith ("h"); // determines whether it starts with "h". Here, "helloword. java "starts with" h "and returns true StringBuffer g = new StringBuffer (" abcde "); // creates a StringBuffer string whose value is" aaaaa "System. out. println ("\ n **************"); System. out. println ("a default string:" + g); System. out. println ("***************"); g. setCharAt (1, 'B'); // specify to replace System. out. println ("\ n starts from 0 and replaces 2nd characters with B:" + g); g. deleteCharAt (1); // specify to delete the System. out. println ("\ n deletes 2nd characters from 0:" + g );}