对list中的元素进行排序

对list中的元素进行排序

public class UserRole implements Serializable {

	private Integer roleLevel;
	private String roleName;
	
	public Integer getRoleLevel() {
		return roleLevel;
	}

	public void setRoleLevel(Integer roleLevel) {
		this.roleLevel = roleLevel;
	}
	public String getRoleName() {
		return roleName;
	}

	public void setRoleName(String roleName) {
		this.roleName = roleName;
	}
}

 

首先按照等级(roleLevel)排序，然后按照名字(roleName)进行排序

 

		Collections.sort(list, new Comparator<UserRole>(){
			public int compare(UserRole a, UserRole b){
				if(a.getRoleLevel()>b.getRoleLevel()){
					return -1;
				}else if(a.getRoleLevel()<b.getRoleLevel()){
					return 1;
				}else{
					return a.getRoleName().compareTo(b.getRoleName());
				}
			}
		});