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[리펙토링] Extract Method

2021-01-27

핵심 키워드 : 코드의 목적이 잘 드러나도록 메소드의 이름을 지어 별도의 메소드로 뽑아낸다. …

1. code

# BEFOR

void printOwing(double amount) { printBanner();
System.out.println(&quot;name:&quot; + \_name); System.out.println(&quot;amount:&quot; +
amount);

}

void printOwing(double amount) { printBanner();

System.out.println("name:" + \_name); System.out.println("amount:" +

amount);

}

# AFTER

void printOwning(double amount) {
    printBanner();

printDetail(amount);

} void printDetail(double amount) { System.out.println(&quot;name:&quot; +
\_name); System.out.println(&quot;amount:&quot; + amount);

}

void printOwning(double amount) {

printBanner();

printDetail(amount);

} void printDetail(double amount) { System.out.println("name:" +

\_name); System.out.println("amount:" + amount);

}

example =======

# 지역변수가 없는 경우 ## befor

void printOwning() {
    Enumeration e = orders.elements() ; double outstanding = 0.0 ;
    //banner dispaly

System.out.println(&quot;\ *************************&quot;);
System.out.println(&quot;***** Customer Owers****&quot;);
System.out.println(&quot;****************\ *\**\ **\***\ \*&quot;);
    // outstaing 계산
        while(e.hasMoreElements()) {
            Order each = (Order)e.nextElements(); outstanding =
            each.getAmount();

        }

    //상세 정보 표시
        System.out.println(&quot;name:&quot; + \_name);
        System.out.println(&quot;amount:&quot; + outstandig);

}

void printOwning() {

Enumeration e = orders.elements() ; double outstanding = 0.0 ;

//banner dispaly

System.out.println("\ *************************");

System.out.println("***** Customer Owers****");

System.out.println("****************\ *\**\ **\***\ \*");

// outstaing 계산

while(e.hasMoreElements()) {

Order each = (Order)e.nextElements(); outstanding =

each.getAmount();

}

//상세 정보 표시

System.out.println("name:" + \_name);

System.out.println("amount:" + outstandig);

}

## after

///////////////////
    printBanner();

    --------------

    // outstaing 계산
        while(e.hasMoreElements()) {
            Order each = (Order)e.nextElements(); outstanding =
            each.getAmount();

        }

    //상세 정보 표시
        System.out.println(&quot;name:&quot; + \_name);
        System.out.println(&quot;amount:&quot; + outstandig);

}

void printBanner(){
    //banner dispaly
    System.out.println(&quot;\ *************************&quot;);
    System.out.println(&quot;***** Customer Owers****&quot;);
    System.out.println(&quot;****************\ *\**\ **\***\ \*&quot;);

}

///////////////////

printBanner();

--------------

// outstaing 계산

while(e.hasMoreElements()) {

Order each = (Order)e.nextElements(); outstanding =

each.getAmount();

}

//상세 정보 표시

System.out.println("name:" + \_name);

System.out.println("amount:" + outstandig);

}

void printBanner(){

//banner dispaly

System.out.println("\ *************************");

System.out.println("***** Customer Owers****");

System.out.println("****************\ *\**\ **\***\ \*");

}

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