小编use*_*537的帖子

我想检查一个Java StringBuilder对象是否包含一个字符.

例如,我有一个数组中的食物列表{apple,pear,orange,peach,cherry},我想在StringBuilder中添加一些随机数量的食物类型.

我如何检查StringBuilder是否包含字符？

我想做两件事

1. 创建一个私有实例变量,它是一个映射

2. 在我的构造函数中创建一个空实例,它实现了一个地图并将其分配给前一个私有实例变量.

我拥有的私有实例是

private final Map<Character, SortedSet<String>> thesaurus = 
                      new HashMap <Character, SortedSet<String>>();

但是如何在构造函数中创建一个实例变量,该变量将在构造函数创建时引用私有变量同义词库.

例如

public class Book{

    private final Map<Character, SortedSet<String>> thesaurus = 
                           new HashMap <Character, SortedSet<String>>();

public Book(){

    super();    
    /* What do i put here as an empty instance 
     * variable that implements a map and how 
     * do i assign it to thesaurus? 
     */
}

我想用另一个单词替换长字符串中所有出现的单词,例如,如果我想在下面的字符串中更改所有出现的单词"very"和"extreme".

string story = "He became a well decorated soldier in the line of fire when he and his men walked into the battle. He acted very bravely and he was very courageous."

我想我会使用这个replaceAll()方法但是我只是插入诸如的单词

story.replaceAll("very ", "extremely ");