java例程练习（计算子串个数）

public class Test { public static void main(String[] args) { String s = "sunjavahahajavaokjavamyjavagoodjava"; String sToFind = "java"; int count = 0; int index = s.indexOf(sToFind); if(index != -1) { count ++; } s = s.substring(index + sToFind.length()); while(s.indexOf(sToFind) != -1) { index = s.indexOf(sToFind); s = s.substring(index + sToFind.length()); count++; } System.out.println(count); } } //优化后<pre name="code" class="java">public class Test { public static void main(String[] args) { String s = "sunjavahahajavaokjavamyjavagoodjava"; String sToFind = "java"; int count = 0; int index = -1; while((index = s.indexOf(sToFind)) != -1) { s = s.substring(index + sToFind.length()); count++; } System.out.println(count); } }