javaの中でString formatとMath種類の実例は詳しく分かります。
javaの中でString formatとMath種類の実例は詳しく分かります。
java文字列フォーマット出力
java文字列フォーマット出力
@Test
public void test() {
// TODO Auto-generated method stub
// printf();
System.out.println(String.format("I am %s", "jj")); //%s
System.out.println(String.format(" %c", 'x')); //%c
System.out.println(String.format("this is %b", true)); //%b
System.out.println(String.format(" %d", 34)); //%d
System.out.println(String.format(" %x", 34)); //%x
System.out.println(String.format(" %o", 34)); //%o
System.out.println(String.format(" %f", 34.0)); //%f
System.out.println(String.format(" %a", 34.0)); //%a
System.out.println(String.format(" %e", 34.0)); //%e
System.out.println(String.format(" %g", 34.0)); //%g
System.out.println(String.format(" %h", 34)); //%h
System.out.println(String.format(" %%")); //%%
System.out.println(String.format(" %n")); //%n
System.out.println(String.format(" %ty",Calendar.getInstance()));
System.out.println(String.format(" %tm",Calendar.getInstance()));
System.out.println(String.format(" %te",Calendar.getInstance()));
//%tx ，x %ty %tm %te
//
System.out.println(String.format("%+d", 10)); //
System.out.println(String.format("|%-5d|", 10)); //%-？
System.out.println(String.format("%04d", 10)); //
System.out.println(String.format("%,f", 999999999.0)); // “,”
System.out.println(String.format("%(f", -999999999.0)); //
System.out.println(String.format("%#x", 34)); // 0x
System.out.println(String.format("%#o", 34)); // 0
System.out.println(String.format("%#f", 34.0)); //
System.out.println(String.format("%f %<3.1f", 34.0f)); // （ ）
System.out.println(String.format("%3.1f", 34.0f)); //
System.out.println(String.format("%2$d,%1$s", "a",1)); // x$
//
System.out.println(String.format(" %tc", new Date())); // tc
System.out.println(String.format(" ― ― %tF", new Date())); // tF ― ― ( )
System.out.println(String.format(" / / %tD", new Date())); // tD / / （ ）
System.out.println(String.format("HH:MM:SS PM/AM %tr", new Date())); // tR HH:MM:SS PM/AM
System.out.println(String.format("HH:MM:SS（24 ）%tT", new Date())); // ( )tT HH:MM:SS 24
System.out.println(String.format("HH:MM（24 ）%tR", new Date())); // ( )tR HH:MM 24
System.out.println(String.format(Locale.US," %tb", new Date())); // tb
System.out.println(String.format(" %tb", new Date())); // tb
System.out.println(String.format(Locale.US," %tB", new Date())); // tB
System.out.println(String.format(" %tB", new Date())); // tB
System.out.println(String.format(Locale.US," %ta", new Date())); // ta
System.out.println(String.format(" %tA", new Date())); // tA
Date date = new Date();
System.out.printf(" ：%tA%n",date);
//C ，
System.out.printf(" （ 0）：%tC%n",date);
//y ，
System.out.printf(" （ 0）：%ty%n",date);
//j ，
System.out.printf(" （ ）：%tj%n",date);
//m ，
System.out.printf(" （ 0）：%tm%n",date);
//d ， （ ， ）
System.out.printf(" （ 0）：%td%n",date);
//e ， （ ）
System.out.printf(" （ 0）：%te",date);
//H
System.out.printf("2 24 （ 2 0）:%tH%n", date);
//I
System.out.printf("2 12 （ 2 0）:%tI%n", date);
//k
System.out.printf("2 24 （ 0）:%tk%n", date);
//l
System.out.printf("2 12 （ 0）:%tl%n", date);
//M
System.out.printf("2 （ 2 0）:%tM%n", date);
//S
System.out.printf("2 （ 2 0）:%tS%n", date);
//L
System.out.printf("3 （ 3 0）:%tL%n", date);
//N
System.out.printf("9 （ 9 0）:%tN%n", date);
//p
String str = String.format(Locale.US, " ( )：%tp", date);
System.out.println(str);
System.out.printf(" （ ）：%tp%n", date);
//z
System.out.printf(" GMT RFC822 :%tz%n", date);
//Z
System.out.printf(" :%tZ%n", date);
//s
System.out.printf("1970-1-1 00:00:00 ：%ts%n", date);
//Q
System.out.printf("1970-1-1 00:00:00 ：%tQ%n", date);
}
@Test
public void test3(){
BigDecimal d = new BigDecimal("123");
BigDecimal e = new BigDecimal("14455552");
System.out.println(Math.pow(123, 12));
System.out.println(d.pow(12));
System.out.println(Math.ceil(12.3));//ceil, 13.0
System.out.println(Math.floor(-12.3));//ceil, -13.0
System.out.println(Math.round(13.3));// 13
System.out.println(Math.round(-13.5));// -13
System.out.println(Math.round(-13.2));// -13
System.out.println(Math.round(-13.7));// -14
}
//
@Test
public void test4(){
System.out.println(Math.random());// >=0，+b1
//0-100( 100)
int a =(int)(Math.random()*100);
//0-100( 100)
int b =(int)(Math.random()*101);
//30-100( 100)
int c =(int)(Math.random()*71+30);
//0-10
int d = (int)(Math.random()*10);
System.out.println(a);
System.out.println(b);
System.out.println(c);
System.out.println(d);
}
@Test
public void test5(){
Random r = new Random();
int a = r.nextInt(101);//0-100
}
@Test
public void testId() throws ParseException{
String s = "411123199409203013";
if(s.length()==18){
String b = s.substring(6, 14);
String sex = Integer.parseInt(s.substring(14, 17))%2==0?" ":" ";
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
Date birth = sdf.parse(b);//
sdf = new SimpleDateFormat("yyyy MM dd ");
System.out.println(" "+sdf.format(birth)+"， "+sex);
String f = String.format(" %1$TY %1$Tm %1$Td , %2$s", birth,sex);
System.out.println(f);
}else if(s.length()==15){
String b = s.substring(6, 14);
String sex = Integer.parseInt(s.substring(14, 17))%2==0?" ":" ";
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
Date birth = sdf.parse(b);//
sdf = new SimpleDateFormat("yyyy MM dd ");
System.out.println(" "+sdf.format(birth)+"， "+sex);//format
}