【java】：实现contains（）方法

public class Test {
    
    
   public static boolean my_contains(String src, String dst) {
    
    
        char[] srcArray = src.toCharArray();
        char[] dstArray = dst.toCharArray();
        int srcLen = srcArray.length;
        int dstLen = dstArray.length;
        for(int i = 0; i < srcLen; i++){
    
    
            boolean find = false;
            if(srcArray[i] == dstArray[0] && (i+dstLen <= srcLen)){
    
    
                int equalCount = 0;
                for (int j = 0; j < dstLen; j++){
    
    
                    if(srcArray[i+j] == dstArray[j]){
    
    
                        equalCount++;
                    }
                }
                if(equalCount == dstLen){
    
    
                    return true;
                }
            }
        }
        return false;
    }
    public static void main(String[] args) {
    
    
        System.out.println( my_contains("abcdefghjk","ded"));
        System.out.println("abcdefghjk".contains("ded"));
        System.out.println( my_contains("abcdefghjk","de"));;
        System.out.println("abcdefghjk".contains("de"));
    }
}