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向上取整:ceil
向下取整:floor
四舍五入:round
System.out.println("5.20 向上取整:"+Math.ceil(5.20));
System.out.println("5.20 向下取整:"+Math.floor(5.20));
System.out.println("5.40 四舍五入:"+Math.round(5.40));
System.out.println("5.50 四舍五入:"+Math.round(5.50));
结果:
5.20 向上取整:6.0
5.20 向下取整:5.0
5.40 四舍五入:5
5.50 四舍五入:6