Arrays
๋ฌธ์์ด ๋น๊ต์ ์ถ๋ ฅ
equals(), toString()
์๋ ์์ ์ฝ๋๋ก ํ์ตํด ๋ณด๊ฒ ์ต๋๋ค.
class Arrays6_1 {
public static void main(String[] args) {
int[] num = {0, 1, 2};
int[][] score = {
{88, 35, 100},
{84, 60, 55},
{100, 99, 72},
{33, 54, 77}
};
System.out.println("Arrays.toString(num) = " + Arrays.toString(num));
System.out.println("Arrays.deepToString(score) = " + Arrays.deepToString(score));
System.out.println();
String[][] strArr1 = {
{"AAA","BBB","CCC"},
{"aaa","bbb","ccc"},
};
String[][] strArr2 = {
{"AAA","BBB","CCC"},
{"aaa","bbb","ccc"},
};
// 1 ์ฐจ์ ๋น๊ต์๋ equals
System.out.println("Arrays.equals(strArr1[0], strArr2[0]) = " + Arrays.equals(strArr1[0], strArr2[0])); // true
System.out.println("Arrays.equals(strArr1[1], strArr2[0]) = " + Arrays.equals(strArr1[1], strArr2[0])); // false
System.out.println("Arrays.equals(strArr1, strArr2) = " + Arrays.equals(strArr1, strArr2)); // false
System.out.println();
// ๋ค์ฐจ์ ๋น๊ต์๋ deepEquals
System.out.println("Arrays.deepEquals(strArr1, strArr2) = " + Arrays.deepEquals(strArr1, strArr2)); // true
}
}
๋ฐฐ์ด ๋ณต์ฌ
copyOf(), copyOfRange()
์๋ ์์ ์ฝ๋๋ก ํ์ตํด ๋ณด๊ฒ ์ต๋๋ค.
class Arrays6_2 {
public static void main(String[] args) {
int[] arr = {0,1,2,3,4};
System.out.println("Arrays.toString(arr) = " + Arrays.toString(arr));
System.out.println();
// copyOf
int[] arr2 = Arrays.copyOf(arr, arr.length);
System.out.println("Arrays.toString(arr2) = " + Arrays.toString(arr2));
int[] arr3 = Arrays.copyOf(arr, 3);
System.out.println("Arrays.toString(arr3) = " + Arrays.toString(arr3));
int[] arr4 = Arrays.copyOf(arr, 7); // ๋ฒ์๊ฐ ๋์ด๊ฐ๋ ๋ณต์ฌ๋ ์ด๊ธฐํ๊ฐ์ด ๋ค์ด๊ฐ๋ค.
System.out.println("Arrays.toString(arr4) = " + Arrays.toString(arr4));
System.out.println();
// copyOfRange
int[] arr5 = Arrays.copyOfRange(arr, 2, 4);
System.out.println("Arrays.toString(arr5) = " + Arrays.toString(arr5));
int[] arr6 = Arrays.copyOfRange(arr, 0, 7);// ๋ฒ์๊ฐ ๋์ด๊ฐ๋ ๋ณต์ฌ๋ ์ด๊ธฐํ๊ฐ์ด ๋ค์ด๊ฐ๋ค.
System.out.println("Arrays.toString(arr6) = " + Arrays.toString(arr6));
}
}
์ ๋ ฌ
sort()
์๋ ์์ ์ฝ๋๋ก ํ์ตํด ๋ณด๊ฒ ์ต๋๋ค.
class Arrays6_3 {
public static void main(String[] args) {
int[] arr = {3, 1, 8, 5, 9, 2, 10, 7, 6, 4};
System.out.println("Arrays.toString(arr) = " + Arrays.toString(arr));
System.out.println();
Arrays.sort(arr); // ์ค๋ฆ์ฐจ์์ผ๋ก ์ ๋ ฌ๋ฉ๋๋ค.
System.out.println("sort");
System.out.println("Arrays.toString(arr) = " + Arrays.toString(arr));
}
}
Ref. Java์ ์ ์ ๊ธฐ์ดํธ Chapter5(24)
Ref. Arrays
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