java实现小功能

// 自写逻辑，遍历所有匹配的子字符串坐标
private static void forMatchIdx(String str1, String str2) {
char[] arr1 = str1.toCharArray();
char[] arr2 = str2.toCharArray();
f1: for (int i = 0; i < arr1.length; i++) {
for (int j = 0; j < arr2.length; j++) {
if (arr1[i + j] != arr2[j]) {
continue f1;
}
}
System.out.println("idx:" + i);
}
}