优点

• 代码简洁
• 可读性强
• 一种可借鉴的编程思想

应用场景

需要单独明确的代码块处理需求，

简单实例

import java.util.HashMap;
import java.util.Map;
/**
 * 员工信息链式写法
 * */
public class MemberInfoChain {

    private String id;
    private String name;
    private Map<String, Object> baseInfo;
    private String otherInfo;

    public MemberInfoChain setId(String id) {
        this.id = id;
        return this;
    }

    public MemberInfoChain setName(String name) {
        this.name = name;
        return this;
    }

    public MemberInfoChain setBaseInfo(String key, Object value) {
        if(this.baseInfo == null){
            this.baseInfo = new HashMap<>();
        }
        this.baseInfo.put(key,value);
        return this;
    }


    public MemberInfoChain setOtherInfo(String otherInfo) {
        this.otherInfo = new String(new StringBuffer().append(this.otherInfo).append(otherInfo));
        return this;
    }

    @Override
    public String toString() {
        return "MemberInfoChain{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", baseInfo=" + baseInfo +
                ", otherInfo='" + otherInfo + '\'' +
                '}';
    }
}

import java.util.Map;

/**
 * 员工信息一般写法
 */
public class MemberInfo {

    private String id;
    private String name;
    private Map<String, Object> baseInfo;
    private String otherInfo;

    public void setId(String id) {
        this.id = id;
    }
    public void setName(String name) {
        this.name = name;
    }
    public void setBaseInfo(Map<String, Object> baseInfo) {
        this.baseInfo = baseInfo;
    }

    public void setOtherInfo(String otherInfo) {
        this.otherInfo = otherInfo;
    }

    @Override
    public String toString() {
        return "MemberInfo{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", baseInfo=" + baseInfo +
                ", otherInfo='" + otherInfo + '\'' +
                '}';
    }
}

import java.util.HashMap;
import java.util.Map;

/**
 * 测试类
 */
public class TestMain {
    public static void main(String[] args) {

        String id = "1";
        String name = "lili";
        int age = 21;
        String memberLevel = "VIP";
        String otherInfo1 = "other Info1";
        String otherInfo2 = "other Info2";
        String otherInfo3 = "other Info3";


        MemberInfo memberInfo = new MemberInfo();
        Map<String, Object> map = new HashMap<>();
        map.put("age", age);
        map.put("memberLevel", memberLevel);
        StringBuffer sb = new 
        StringBuffer().append(otherInfo1).append(otherInfo2).append(otherInfo3);
        String otherInfo = new String(sb);
        memberInfo.setId(id);
        memberInfo.setName(name);
        memberInfo.setBaseInfo(map);
        memberInfo.setOtherInfo(otherInfo);


        MemberInfoChain memberInfoChain = new MemberInfoChain();
        memberInfoChain.setId(id)
                .setName(name)
                .setBaseInfo("age",age)
                .setBaseInfo("memberLevel",memberLevel)
                .setOtherInfo(otherInfo1)
                .setOtherInfo(otherInfo2)
                .setOtherInfo(otherInfo3);

        System.out.println(memberInfo);
        System.out.println(memberInfoChain);
    }
}

基于实际开发，在logback，极光推送l链式编程的理解