53 lines
1.0 KiB
Markdown
53 lines
1.0 KiB
Markdown
- 长度固定，内容固定
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- ```java
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private final char value[]
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```
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- [[数组]]导致长度不能变，[[final]]导致内容不能变
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- 写法
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- 字面量写法
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- ```java
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String name = "Kelly" //在全局字符串常量池
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```
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- 使用对象[[new]]
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- ```java
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String tel = new String("123")
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```
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- 常见方法
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- [[indexOf]]
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- [[charAt]]
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- [[concat]]
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- [[contains]]
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- [[equals]]
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- 判断两字符串内容是否相同
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- [[equalsIgnoreCase]]
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- [[startWith]]
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- [[endWith]]
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- [[getBytes]]
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- [[toCharArry]]
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- [[isEmpty]]
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- [[trim]]
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- [[split]]
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- [[substring]]
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- [[replace]]
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- [[lastIndexOf]]
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- [[toUpperCase]]
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- [[toLowerCase]]
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- [[valueOf]]
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- [[intern]]
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- [[length]]
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- 字符串合并创建 #Java面试
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- ```java
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"Hello"和"Hel"+"lo"是同一个对象
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```
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- ```java
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"Hel""lo"",World"
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a = "Hel" + "lo" + ",World"
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Hello，world
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共创建了5个字符串对象
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"Hel" + "lo" 时会创建一个
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```
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- ```java
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String a = "Hello"
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String b = new String("Hello")
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创建了两个对象
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``` |