Java删除两个字符串中的相同元素(带符号)

String str1 = "张三,李四,王五,陈六,吕七,孙八,赵九";
String str2 = "王五,孙八";

String[] arr1 = str1.split(",");
String[] arr2 = str2.split(",");
for (int i = 0; i < arr2.length; i++) {
for (int j = 0; j < arr1.length; j++) {
if (arr1[j].equals(arr2[i])) {
arr1[j] = "";
}
}
}

StringBuffer sb = new StringBuffer();
for (int j = 0; j < arr1.length; j++) {
if (!"".equals(arr1[j])) {
sb.append(arr1[j] + ",");
}
}

System.out.println("结果："+ sb.toString().substring(0, sb.toString().length() - 1));