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【Java】【基本数据类型】数字字符串和数值型数据有什么区别?

数据类型不同，使用起来自然也不同了，数值型数据可以进行加减乘除操作，字符串则不行，而字符串可以进行字符串连接操作，比如将“123”和“456”连接起来，就是“123456”了，数字字符串可以通过基本数据类型的包装类转换成数值型。两种数据类型所占的内存空间也是不一样的，字符串占2个字节，而数值型则不...

《Java安全编码标准》一2.13　IDS12-J在不同的字符编码中无损转换字符串数据

2.13　IDS12-J在不同的字符编码中无损转换字符串数据在String对象之间进行转换时，如果涉及不同的编码类型，可能会导致数据丢失。根据Java API[API 2006] 对?String.getBytes(Charset)方法的描述：该方法总会替代那些错误格式的输入和不可映射的字符序列，...

java 如何处理指定格式的字符串数据？

`Class1:nullnullnull[null]Class2:nullnullnull[null]Class3:nullnullnull[null]Class4:nullnullnull[null]Class5:nullnullnull[null]Class6:nullnullnull[null...

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