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ArrayDemo.java
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126 lines (93 loc) · 3.39 KB
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package arraydemo;
public class ArrayDemo {
public static void main(String[] args) {
int[] a = new int[5];
int b[] = {1, 2, 3, 4, 5};
double[] myList = new double[10];
myList[0] = 1;
myList[1] = 2;
myList[2] = 3;
myList[3] = -24;
myList[4] = 55;
myList[5] = 6;
myList[6] = 7;
myList[7] = 123;
myList[8] = 9;
myList[9] = 10;
System.out.println("first element of myList:" + myList[0]);
System.out.println("first element of myList:" + myList[5]);
System.out.println("===============================");
for (int index = 0; index < myList.length; index++) {
System.out.println(myList[index]);
}
System.out.println("==============for-each loop=============");
for (Double item : myList) {
System.out.println(item);
}
double sum = 0;
for (Double item : myList) {
sum += item;
}
System.out.println("sum:" + sum);
double max = myList[0];
for (int index = 1; index < myList.length; index++) {
if (myList[index] > max) {
max = myList[index];
}
}
System.out.println("max:" + max);
int arr1[] = {0, 1, 2, 3, 4, 5};
int arr2[] = {5, 10, 20, 30, 40, 50};
int arr3[] = new int[arr1.length];
// copies an array from the specified source array
System.arraycopy(arr1, 0, arr2, 0, 1);
System.out.print("array2 = ");
System.out.print(arr2[0] + " ");
System.out.print(arr2[1] + " ");
System.out.print(arr2[2] + " ");
System.out.print(arr2[3] + " ");
System.out.print(arr2[4] + " ");
System.out.print(arr2[5] + " ");
System.out.println();
System.arraycopy(arr1, 0, arr3, 0, arr1.length);
for (int item : arr3) {
System.out.print(item + " ");
}
int arr4[] = new int[arr1.length];
for (int i = 0; i < arr1.length; i++) {
arr4[i] = arr1[i];
}
System.out.println();
for (int item : arr4) {
System.out.print("arr4:" + item + " ");
}
int arr5[] = arr1.clone();
System.out.println();
for (int item : arr5) {
System.out.print(item + " ");
}
System.out.println();
showArrayElement(arr1);
char[][] answers = {
{'A', 'B', 'A', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},
{'D', 'B', 'A', 'B', 'C', 'A', 'E', 'E', 'A', 'D'},
{'E', 'D', 'D', 'A', 'C', 'B', 'E', 'E', 'A', 'D'},
{'C', 'B', 'A', 'E', 'D', 'C', 'E', 'E', 'A', 'D'},
{'A', 'B', 'D', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},
{'B', 'B', 'E', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},
{'B', 'B', 'A', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},
{'E', 'B', 'E', 'C', 'C', 'D', 'E', 'E', 'A', 'D'}};
answers[0][2] = 'D';
for (int r = 0; r < answers.length; r++) {
for (int c = 0; c < answers[r].length; c++) {
System.out.print(answers[r][c] + " ");
}
System.out.println();
}
}
public static void showArrayElement(int[] array) {
for (int i = 0; i < array.length; i++) {
System.out.println(array[i]);
}
}
}