叮当小马

摘要： import java.util.Arrays; public class JavaArray { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub //创建一维数组： int arr[] = new int[]{1,2,3,5,15}; int arr2[] = {23,12,6}; int day[] = new int[]{31,28,31,30,31,30,31,30,31,30,31,31}; for(int i=0;i12;i++) { System.out.println((i+1)+"月有"+day[i]+"天"); } //二级数组： //int a[][] = new int[2][]; //a[0] = new int[2]; //a[1] = new int[3]; int a[][] = new int[][] 阅读全文

摘要： import java.util.Date; public class JavaString { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub //char to string char a[] = {'g','o','o','d','.'}; String s = new String (a); //全部字符 System.out.println(s); String ss = new String (a,2,2);//部分字符 System.out.println(ss); //多个字符串连接 String s1 = new String ("Hello"); String s2 = new String ("World"); String sss = s1 + " "+ s2; System.out.println(sss); 阅读全文

摘要： public class GetIfElse { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub //if语句 int x = 45; int y = 12; if(xy) { System.out.println("变量xy"); } if(x30) { System.out.println("z30"); }else if(z10) { System.o 阅读全文

摘要： public class MyNumber { static String s1="您好。"; public static void main(String[] args) { // TODO Auto-generated method stub String s2 = "Java"; System.out.println(s1); System.out.println(s2); //byte short int long byte mybyte = 124; //-128-127 short myshort = 32564; //-32768 - 32767 int myint=45784612; long mylong = 46789451; long result = mybyte + myshort +myint + mylong; System.out.println("结果为：" + result); // float double; float f1 = 13.23f 阅读全文