使用Math.abs(x) Integer a = -1; double d = -2; float f = -3; Math.abs(a)

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java 取绝对值使用 Math abs x Integera 1 doubled 2 floatf 3 Math abs a
使用Math.abs(x) Integer a = -1; double d = -2; float f = -3; Math.abs(a)

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