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                ## String - 方法 ``` trim() 刪除字符串兩端空格 * split() 分割字符串 * replace() 替換字符串 * equals() 判斷兩個字符串的值是否相等 * equalsIgnoreCase() 忽略大小寫比較 startswith() 判斷字符串是否以開頭 endswith() 判斷字符串是否以結尾 * charAt() 指定下標,返回下標對應的字符 * substring() 字符串截取 * tocharArray() 將字符串轉換成字符數組 toUpperCase() 將字符串小寫字符轉為大寫 toLowerCase() 將字符串大寫字符轉為小寫 indexof(String str) 獲取字符串str在指定對象中第一次出現的索引 * intern()當出現字符串拼接時,如果拼接結果出現在常量池中,不會產生新的常量。 ```
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