1.工具类，判断是否都是字符串中是否全是都是数字，判断字符串中是否含有数组
public class StringUtils {
/**
* 判断字符串是否全是数字
* @param str
* @return
*/
public static boolean isInteger(String str) {
if(str ==null){
return false;
}
Pattern pattern = Pattern.compile("^[-\\+]?[\\d]*$");
return pattern.matcher(str).matches();
}
//截取数字
public static StringgetNumbers(String content) {
Pattern pattern = Pattern.compile("\\d+");
Matcher matcher = pattern.matcher(content);
while (matcher.find()) {
return matcher.group(0);
}
return null;
}
}
//先按gradeCode 升序 然后 按classCode 中的str 部分升序 最后按 classCode 中的num部分升序
数据源
public class ClassUtils {
public static ListgetClassList() {
List classEntityList =new ArrayList<>();
classEntityList.add(new ClassEntity("一年级A1班","A1","1","一年级"));
classEntityList.add(new ClassEntity("一年级A2班","A2","1","一年级"));
classEntityList.add(new ClassEntity("一年级A3班","A3","1","一年级"));
classEntityList.add(new ClassEntity("一年级A4班","A4","1","一年级"));
classEntityList.add(new ClassEntity("一年级1班","1","1","一年级"));
classEntityList.add(new ClassEntity("一年级22班","22","1","一年级"));
classEntityList.add(new ClassEntity("一年级2班","2","1","一年级"));
classEntityList.add(new ClassEntity("一年级11班","11","1","一年级"));
classEntityList.add(new ClassEntity("一年级A11班","A11","1","一年级"));
classEntityList.add(new ClassEntity("一年级A22班","A22","1","一年级"));
classEntityList.add(new ClassEntity("一年级B1班","B1","1","一年级"));
classEntityList.add(new ClassEntity("一年级B22班","B22","1","一年级"));
classEntityList.add(new ClassEntity("一年级B12班","B12","1","一年级"));
classEntityList.add(new ClassEntity("二年级A1班","A1","2","二年级"));
classEntityList.add(new ClassEntity("二年级A1班","A2","2","二年级"));
classEntityList.add(new ClassEntity("二年级A1班","A11","2","二年级"));
classEntityList.add(new ClassEntity("二年级A1班","B1","2","二年级"));
classEntityList.add(new ClassEntity("二年级A1班","B21","2","二年级"));
classEntityList.add(new ClassEntity("二年级A1班","B12","2","二年级"));
return classEntityList;
}
}
//排序
List classEntityList = ClassUtils.getClassList();
Map> gradeList = classEntityList.stream().sorted(Comparator.comparing(ClassEntity::getGradeCode, (x, y) -> {
return x.compareTo(y);
}).thenComparing(Comparator.comparing(ClassEntity::getClassCode, (codeX, codeY) -> {
if (StringUtils.isInteger(codeX) && StringUtils.isInteger(codeY)) {
return (Integer.valueOf(codeX) - Integer.valueOf(codeY)) >0 ?1 : (Integer.valueOf(codeX) - Integer.valueOf(codeY)) ==0 ?0 : -1;
}else if (StringUtils.isInteger(codeX) && !StringUtils.isInteger(codeY)) {
return -1;
}else if (!StringUtils.isInteger(codeX) && StringUtils.isInteger(codeY)) {
// 返回 1 codeX 和codeY位置对调
return 1;
}else {
// 一年级 A11班 二年级 A22 班
if (StringUtils.getNumbers(codeX) !=null && StringUtils.getNumbers(codeY) !=null) {
String numX = StringUtils.getNumbers(codeX);
String numY = StringUtils.getNumbers(codeY);
String strX = codeX.substring(0, codeX.indexOf(numX));
String strY = codeY.substring(0, codeY.indexOf(numY));
if (strX.compareTo(strY) !=0) {
return strX.compareTo(strY);
}else {
return (Integer.valueOf(numX) - Integer.valueOf(numY)) >0 ?1 : (Integer.valueOf(numX) - Integer.valueOf(numY)) ==0 ?0 : -1;
}
}
}
return -1;
}))).collect(Collectors.groupingBy(ClassEntity::getGradeCode));
for(Map.Entry> entry : gradeList.entrySet()) {
System.out.println(entry.getKey());
entry.getValue().stream().forEach(item -> System.out.println(item));
}
}
