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public class PrintIdentityMatrix {
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public static void main(String[] args) {
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int n = 5;
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int[][] array = new int[n][n];
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IntStream.range(0, n).forEach(i -> array[i][i] = 1);
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Arrays.stream(array)
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.map((int[] a) -> Arrays.toString(a))
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.forEach(System.out::println);
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}
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}
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