Question

我是Java和HBase的初学者，我想缩短我的代码，所以我在代码中使用了for循环。如果输入String stumber是＆＃34; AAAA0000？0＆＃34;，结果应为＆＃34; AAAA000000＆＃34;，＆＃34; AAAA000010＆＃34;，＆＃34; AAAA000020＆＃34;，＆＃ 34; AAAA000030＆＃34; ......＆＃34; AAAA000090＆＃34;

此原始代码效果很好：

    List<Get> gets = new ArrayList<>();  
    for (String stumber : stumbersArr) {
        if(stumber.charAt(8) == '?'){
        get = new Get((stumber.replace(stumber.charAt(8), '0')).getBytes());  
        get.setMaxVersions(versions);  
        gets.add(get);  
        get = new Get((stumber.replace(stumber.charAt(8), '1')).getBytes());  
        get.setMaxVersions(versions);  
        gets.add(get);  
        get = new Get((stumber.replace(stumber.charAt(8), '2')).getBytes());  
        get.setMaxVersions(versions);  
        gets.add(get);  
        get = new Get((stumber.replace(stumber.charAt(8), '3')).getBytes());  
        get.setMaxVersions(versions);  
        gets.add(get);  
        get = new Get((stumber.replace(stumber.charAt(8), '4')).getBytes());  
        get.setMaxVersions(versions);  
        gets.add(get);  
        get = new Get((stumber.replace(stumber.charAt(8), '5')).getBytes());  
        get.setMaxVersions(versions);  
        gets.add(get);  
        get = new Get((stumber.replace(stumber.charAt(8), '6')).getBytes());  
        get.setMaxVersions(versions);  
        gets.add(get);  
        get = new Get((stumber.replace(stumber.charAt(8), '7')).getBytes());  
        get.setMaxVersions(versions);  
        gets.add(get);  
        get = new Get((stumber.replace(stumber.charAt(8), '8')).getBytes());  
        get.setMaxVersions(versions);  
        gets.add(get);  
        get = new Get((stumber.replace(stumber.charAt(8), '9')).getBytes());  
        get.setMaxVersions(versions);  
        gets.add(get);  
        }else{
            get = new Get(stumber.trim().getBytes());  
            get.setMaxVersions(versions);  
            gets.add(get);  
        }
    }  
    Result[] results = table.get(gets);

但是在用for-loop修改后，代码无法给出结果。为什么？

    List<Get> gets = new ArrayList<>();  
    for (String stumber : stumbersArr) {
        if(stumber.charAt(8) == '?'){
            for (int i =0; i<10; i++){
                get = new Get((stumber.replace(stumber.charAt(8), 'i')).getBytes());  
                get.setMaxVersions(versions);  
                gets.add(get);  
            }
        }else{
            get = new Get(stumber.trim().getBytes());  
            get.setMaxVersions(versions);  
            gets.add(get);  
        }
    }  
    Result[] results = table.get(gets);

Answer 1

您可以使用Character.forDigit（）将int i转换为char，如：

get = new Get((stumber.replace(stumber.charAt(8), Character.forDigit(i, 10))).getBytes());

Answer 2

内部for循环应该是：

get = new Get((stumber.replace(stumber.charAt(8), (char)(i + '0'))).getBytes());

什么使i值为char。

在我的情况下，for（）循环有什么问题？

2 个答案: