Android新手求助：Java字符串金字塔打印问题修正

问题描述 #

我是Android开发新手，尝试用Java实现特定样式的字符串金字塔打印，但输出不符合预期。我希望打印从“roo”开始，当前输出却包含了多余的前置行（r、ro），需要修正代码实现目标效果。

现有实现代码 #

String searchQuery = "rooms in mumbai";

int n = searchQuery.length();

for (int i = 0; i<=n; i++)
{
    for (int j = 0; j<=i-1; j++)
    {
        System.out.print(searchQuery.charAt(j));
    }
    System.out.println();
}

当前错误输出 #

r
ro
roo
room
rooms
rooms 
rooms i
rooms in
rooms in 
rooms in m
rooms in mu
rooms in mum
rooms in mumb
rooms in mumba
rooms in mumbai

修正方案 #

1. 调整外层循环起始值：将i的初始值从0改为3，因为“roo”对应字符串的前3个字符（索引0-2），直接跳过不需要的前置行。
2. 保持循环终止条件：依然使用i<=n，确保能打印到完整的目标字符串。

修正后代码 #

String searchQuery = "rooms in mumbai";

int n = searchQuery.length();

// 从i=3开始，对应输出前3个字符"roo"
for (int i = 3; i<=n; i++)
{
    for (int j = 0; j<=i-1; j++)
    {
        System.out.print(searchQuery.charAt(j));
    }
    System.out.println();
}

修正后输出 #

roo
room
rooms
rooms 
rooms i
rooms in
rooms in 
rooms in m
rooms in mu
rooms in mum
rooms in mumb
rooms in mumba
rooms in mumbai

内容的提问来源于stack exchange，提问作者Vivek M Fauzdar