List<String>转化为以","隔开的字符串代码,Java代码库,德仔网

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【Java】 List转化为以","隔开的字符串
作者:烨鑫 / 发布于2016/12/13/ 838
import java.util.ArrayList;
import java.util.List;
/**
 * 集合操作
 * @author intrl
 * @date 2010-12-15
 * @version 1.0
 */
public class Test {
 
    public static void main(String[] args) {
        List<String> list=new ArrayList<String>();
        list.add("aaa");
        list.add("bbb");
        list.add("ccc");
        System.out.println(listToString(list));//aaa,bbb,ccc
    }
     
    public static String listToString(List<String> stringList){
        if (stringList==null) {
            return null;
        }
        StringBuilder result=new StringBuilder();
        boolean flag=false;
        for (String string : stringList) {
            if (flag) {
                result.append(",");
            }else {
                flag=true;
            }
            result.append(string);
        }
        return result.toString();
    }
}


import java.util.ArrayList;
import java.util.List;
/**
 * 
 * @author intrl
 * @date 2010-12-23
 * @version 1.0
 */
public class Test {
 
    public static void main(String[] args) {
 
        List<Person> list = new ArrayList<Person>();
        list.add(new Person("张三", 15));
        list.add(new Person("李四", 12));
        list.add(new Person("王五", 10));
        // 打印年龄不小于12岁的人员
        System.out.println(listToString(list, 12, "&"));// 张三&李四
    }
 
    /**
     * 获取年龄>=age的人员信息
     * 
     * @param list
     * @param age
     * @return
     */
    public static String listToString(List<Person> list, int age, String sep) {
        if (list == null) {
            return null;
        }
        StringBuilder result = new StringBuilder();
        boolean flag = false;
        for (Person person : list) {
            if (person.getAge() < age) {
                continue;
            }
            if (flag) {
                result.append(sep==null?"":sep);
            } else {
                flag = true;
            }
            result.append(person.toString());
        }
        return result.toString();
    }
}
 
class Person {
    private String name;
    private int age;
 
    public Person() {
    }
 
    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }
 
    public String getName() {
        if (name == null) {
            name = "";
        }
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public int getAge() {
        return age;
    }
 
    public void setAge(int age) {
        this.age = age;
    }
 
    @Override
    public String toString() {
        return getName();
    }
}
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