Java 兩個逗號串，獲取相同字符串 以及 不同字符串

獲取相同的字符串

String str1 = "A,B,C,D,E,F,G";
String str2 = "C,D,Z,H,R";
String [] strs1 = str1.split("[,]");//防止str1爲null
List<String> list = Arrays.asList(strs1);//防止strs1爲null
String [] strs2 = str2.split("[,]");//防止str2爲null
String s = "";
for (int i = 0; i < strs2.length; i++) {
    if(list.contains(strs2[i]) && "".equals(s)){
        s = strs2[i];      
    } else if(list.contains(strs2[i]) && !"".equals(s)){
        s = s + "," + strs2[i];
    }
}
System.out.println(s);//C,D

獲取不同的字符串

方法一:上面的代碼改下if判斷

String str1 = "A,B,C,D,E,F,G";
String str2 = "C,D,Z,H,R";
String [] strs1 = str1.split(",");
List<String> list = Arrays.asList(strs1);
String [] strs2 = str2.split(",");
String s = "";
for (int i = 0; i < strs2.length; i++) {
    if(!list.contains(strs2[i]) && "".equals(s)){
        s = strs2[i];      
    } else if(!list.contains(strs2[i]) && !"".equals(s)){
        s = s + "," + strs2[i];
    }
}
System.out.println(s);//Z,H,R

方法二:

String str1= "A,B,C,D,E,F,G";
String str2=  "C,D,Z,H,R";
// 先轉換成list
List<String> list = Arrays.asList(str2.split(","));
// 轉換成ArrayList
List arrayList = new ArrayList(list);
// 遍歷ArrayList
Iterator<String> it = arrayList.iterator();
while (it.hasNext()) {
    String x = it.next();
    // 如果存在，直接刪除
    if (str1.indexOf(x) != -1) {
        it.remove();
    }
}
String s= StringUtils.join(arrayList.toArray(), ",");
System.out.println(s);//Z,H,R