StringBuilder类-toString()方法_stringbuildertostring方法

StringBuilder类-toString()方法

StringBuilder->String：可用StringBuilder中的toString方法

//String -> StringBuilder
String str = "hello";
StringBuilder bu = new StringBuilder(str);

//往StringBuilder中添加数据
bu.appeng("world");
System.out.println(bu);		//helloworld 变成StringBuilder类型

//StringBuilder -> String
String s = bu.toStirng();
System.out.println(s);		//helloworld，变成String类型

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