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IntDetail.java

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public class IntDetail {

//编写一个main方法

public static void main(String[] args) {

//Java的整型常量（具体值）默认为 int 型，声明long型常量须后加‘l’或‘L’

int n1 = 1;//4个字节

//int n2 = 1L;//对不对?不对

long n3 = 1L;//对

}

}