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class Math {
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static double abs(double num) {
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if (num < 0) {
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return -num;
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} else {
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return num;
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}
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}
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}
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class System {
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//todo：后面再检查这个方法是否正确
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// src:源数组；
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// srcPos:源数组要复制的起始位置；
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// dest:目的数组；
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// destPos:目的数组放置的起始位置；
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// length:复制的长度。
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static void arraycopy(List<String?> src, int srcPos, List<String?> dest,
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int destPos, int length) {
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List.copyRange(dest, destPos, src, srcPos, srcPos+length);
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}
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}
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