1 StringBuilder a = new StringBuilder("This is testDemo"); 2 String b = "Hello"+a; //将StringBuilder类型转换成String类型
3 StringBuilder a = new StringBuilder(a); //将String类型转换为StringBuilder类型
1 StringBuilder a = new StringBuilder("This is testDemo"); 2 String b = "Hello"+a; //将StringBuilder类型转换成String类型
3 StringBuilder a = new StringBuilder(a); //将String类型转换为StringBuilder类型
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