代码重构之引入解释性变量

意图

• 临时变量可以帮助你将表达式分解为比较容易管理的形式

• 在较长的算法中，可以运用临时变量来解释每一步运算的意义

示例

/**
 * 引入解释性变量之前
 * Created by luo on 2017/4/23.
 */
public class IntroduceExplainingVariableBefore {
    private String platform;
    private String browser;
    private int resize = 0;

    public void test(){
        if ((platform.toUpperCase().indexOf("MAC") > -1) && (browser.toUpperCase().indexOf("IE") > -1) && wasInitialized() && resize > 0){
            //do something
        }
    }

    private boolean wasInitialized() {
        return false;
    }
}
/**
 * 引入解释性变量之后
 * Created by luo on 2017/4/23.
 */
public class IntroduceExplainingVariableAfter {
    private String platform;
    private String browser;
    private int resize = 0;

    public void test() {
        final boolean isMacOs = platform.toUpperCase().indexOf("MAC") > -1;
        final boolean isIEBrowser = browser.toUpperCase().indexOf("IE") > -1;
        final boolean wasResized = resize > 0;

        if (isMacOs && isIEBrowser && wasInitialized() && wasResized) {
            //do something
        }
    }

    private boolean wasInitialized() {
        return false;
    }
}