java例程练习（计算子串个数） - JAVA

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);

}
}

[java]
//优化后
[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); 
 
     } 
 
 } 
 
 
 
 
 
 
 
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