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自动导包:ctrl+shift+o
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代码补全:alt + "/"
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数字定义
public class demo1 { public static void main(String[] args) { int arr[] = new int[3]; int arr1[] = new int[] {1,2,3}; int arr2[][] = new int[][] {{1,2,3},{4,5,6}}; for(int i:arr1) { // System.out.println(i); } System.out.println(arr2[1][0]); } }
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面向对象
多行注释:ctr+shift+/