原代码

int beerNum=99;
        String word="bottles";
        
        while(beerNum>0) {
            if(beerNum==1) {
                word="bottle";//单数的瓶子
            }
            System.out.println(beerNum+" "+word+" of beer on the wall");
            System.out.println(beerNum+" "+word+" of beer.");
            System.out.println("Take one down.");
            System.out.println("Pass it around.");
            beerNum = beerNum - 1;
            
            if(beerNum > 0) {
                System.out.println(beerNum+" "+word+" of beer on the wall");
            }else {
                System.out.println("No more bottles of beer on the wall");
            }
        }

因为当有1个瓶子的时候，会输出bottles，所以改进了一下

public static void main(String[] args) {
        // TODO Auto-generated method stub
        int beerNum=99;
        String word="bottles";
        
        while(beerNum>0) {
            if(beerNum==1) {
                word="bottle";//单数的瓶子
            }
            System.out.println(beerNum+" "+word+" of beer on the wall");
            System.out.println(beerNum+" "+word+" of beer.");
            System.out.println("Take one down.");
            System.out.println("Pass it around.");
            beerNum = beerNum - 1;
            
//          if(beerNum > 0) {
//              System.out.println(beerNum+" "+word+" of beer on the wall");
//          }else {
//              System.out.println("No more botles of beer on the wall");
//          }
        }
        System.out.println("No more botles of beer on the wall");
    }

将while里面的判断注释掉，0个瓶子的结果拿到后面来