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Hello.java

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public class Hello {

public static void main(String[] args) {

int num1 = 1; // 字面量1;

double num2 = 2.0D; // 大小写的D都可以

long num3 = 3L; // 大小写的L都可以, 加L是好习惯;

byte num4 = 4; // 可以直接赋予 [-128, 127] 范围内的字面量;

if ("".length() < 10) {

// 错误用法: num2 + num3 = 2.03

System.out.println("错误用法: num2 + num3 = " + num2 + num3);

}

for (int i = 0; i < num1; i++) {

// 四则运算: num1 * num4 = 4

System.out.print("四则运算: num1 * num4 = ");

System.out.println(num1 * num4);

}

}

}