Java 计算同比增长工具类

布满荆棘的人生 2024-03-26 14:57 71阅读 0赞

为了数据的严谨性，统一装换为BigDecimal,话不多说，看代码。

package com.pig4cloud.pigx.admin.api.util;
    
    import java.math.BigDecimal;
    
    
    public class PercentCount {
        
    
    	public String percentBigDecimal(BigDecimal preNum,BigDecimal sufNum){
        
    		double result = countDecimal(preNum,sufNum);
    		if(result>0){
        
    			return "+"+result+"%";
    		}
    		if(result<0){
        
    			return result+"%";
    		}
    		if(result==0){
        
    			return "+"+0+"%";
    		}
    		return null;
    	}
    	public  double countDecimal(BigDecimal preNum,BigDecimal sufNum){
        
    		boolean preBoolean = verifyNum(preNum);
    		boolean sufBoolean = verifyNum(sufNum);
    		//同时为true计算
    		if(preBoolean && sufBoolean){
        
    			boolean b = verifyEqual(preNum, sufNum);
    			if (b == false){
        
    				return realCountDecimal(preNum,sufNum);
    			}
    			if (b){
        
    				return 0;
    			}
    		}
    		if(preBoolean == false && sufBoolean ==false){
        
    			return 0;
    		}
    		if(sufBoolean ==false){
        
    			return 100;
    		}
    		return  0;
    	}
    	//验证数字是否为零和null
    	public boolean verifyNum(BigDecimal num){
        
    		if(null !=num && num.compareTo(BigDecimal.ZERO)!=0 ){
        
    			return true;
    		}
    		return false;
    	}
    
    	//验证两个数字是否相等
    	public boolean verifyEqual(BigDecimal preNum,BigDecimal sufNum){
        
    		int n = preNum.compareTo(sufNum);
    		//比较 -1 小于   0 等于    1 大于
    		if(n==0){
        
    			return true;
    		}
    		return false;
    	}
    	//真正计算
    	public double realCountDecimal(BigDecimal preNum,BigDecimal sufNum){
        
    		//(前面的数字-后面的数字)/后面的数字*100
    		BigDecimal bigDecimal = (preNum.subtract(sufNum)).divide(sufNum,4,BigDecimal.ROUND_HALF_UP).multiply(new BigDecimal("100")).setScale(2, BigDecimal.ROUND_UP);
    		if (bigDecimal.compareTo(BigDecimal.ZERO) !=0){
        
    			return  bigDecimal.doubleValue();
    		}
    		return 0;
    	}
    
    	public static void main(String[] args) {
        
    		PercentCount p = new PercentCount();
    		BigDecimal a = new BigDecimal("3");
    		BigDecimal b = new BigDecimal("1");
    		String percent = p.percentBigDecimal(a, b);
    		System.out.println(percent);
    	}
    
    }

放丢失备份，原文链接：https://blog.csdn.net/qq\_42274641/article/details/98640070