Java数组
数组
public class Array {
public static void main(String[] args) {
// 1、静态初始化
int[] arrayIntA = new int[] { 11, 22, 33, 44, 55 };
for (int i = 0; i <= 4; i++) {
System.out.println("数组值" + "[" + i + "] " + arrayIntA[i]);
}
System.out.println('\r');// 换行
for (int j : arrayIntA) {
System.out.println("数组值："+j);
}
// 赋值
arrayIntA[2] = 9;
// 取值
System.out.println("arrayIntA的第三个元素是:" + arrayIntA[2]);
// 2、动态初始化
String[] arrayStringA = new String[8];
//System.out.println(arrayStringA);
System.out.println('\r');// 换行
// 遍历数组赋值
for (int i = 0; i < arrayStringA.length;i++ ) {
arrayStringA[i] = String.valueOf(i);
}
// 遍历数组取值
for (int i = 0; i < arrayStringA.length; i++) {
System.out.print(arrayStringA[i]+" ");
}
System.out.println('\r');// 换行
int[] aaa = new int[] { 1, 3, 5, 9, 18, 32 };
for (int b : aaa) {
System.out.println("aaa的值：" + b);
}
for (int m = 0; m < aaa.length; m++) {
System.out.println("数组aaa["+m+"]的值："+aaa[m]);
}
int[][] arrayA = new int[][] { { 1, 2 }, { 3, 4 }, { 5, 6 } };
System.out.println("------使用for循环将星期遍历出来------");
for (int i = 1; i < 8; i++) {
int weekDay = i;
switch (weekDay) {
case 1: System.out.println("星期一");
break;
case 2:
System.out.println("星期二");
break;
case 3:
System.out.println("星期三");
break;
case 4:
System.out.println("星期四");
break;
case 5:
System.out.println("星期五");
break;
case 6:
System.out.println("星期六");
break;
case 7:
System.out.println("星期日");
break;
default:
System.out.println("无效输入");
}
}
// for循环
int sum = 0;
for (int i = 1; i < 101; i++) {
sum += i;
}
System.out.println("for_1加到10的和为 " + sum);
// while循环
int i = 1;
int total = 0;
while (i < 11) {
total += i;
i++;
}
System.out.println("while_1加到10的和为 " + total);
int[] ints = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
for (int x : ints) {
System.out.print(x);
System.out.print(",");
}
System.out.println('\r');// 换行
String[] strs = { "string1", "string2", "string3", "string4" };
for (String str : strs) {
System.out.print(str);
System.out.print(",");
}
}
}
效果图展示：