張佑維.HTML.CSS JavaScript.Java

/*張佑維2022/10/24,Java data type,資料型態*/ public class Main { public static void main(String[] args) { int myNum = 5; //宣告整數integer (whole number),4位元組bytes float myFloatNum = 5.99f; //浮點數=實數,floating point number,4位元組bytes double doubleNum=5.99d; //倍精數,8位元組,8bytes,和long長整數 char myLetter = 'D', littlePig='g'; //*字元character=角色,2位元組bytes=16位元bits boolean myBool = true; //布林boolean,1位元bit,0或1,false or true String myText = "張佑維"; // 字串String,非原型資料,長度變動的 System.out.println(myNum); //系統的.輸出的.列印print且換列ln=line System.out.println(myFloatNum);System.out.println(myLetter);System.out.println(myBool); System.out.println(myText); myNum = myLetter; System.out.println(myNum); System.out.println(myLetter); System.out.println(myBool); System.out.println(myText); myNum=littlePig;System.out.println(myNum); for (int k=1; k <10; k=k+3) System.out.print(k + " "); } } 挪威w3schools

Java迴圈,字串String /*張佑維2022/10/17,w3schools學習,for迴圈loop*/ public class Main{ public static void main(String[] args) { int i, j, k=10; /*宣告整數integer i,j,k*/ String a="第", b="列:"; /*宣告字串a,b*/ for ( i = 1; i <= k; i++) { /*迴圈一次增加1, i=i+1可用i++執行*/ System.out.print(a+i+b); /*系統System的.out輸出.println列印,line列*/ for ( j = 0; j <= i; j++) /*迴圈內僅有一指令,可以不用{...}*/ System.out.print(j); /*系統System的.out輸出.print列印*/ System.out.println(); /*純粹換line換列*/ } } } 挪威w3schools學習Java(甲骨文Oracle公司維護)截圖 css指令 Java試探統一碼UNICODE /*張佑維2022/10/17,w3schools學習,for迴圈loop*/ public class Main{ public static void main(String[] args) { int i, j, k=10; /*宣告整數integer i,j,k*/ String a="第", b="列:"; /*宣告字串a,b*/ for ( i = 1; i <= k; i++) {/*迴圈一次增加1, i=i+1可用i++執行*/ System.out.print(a+i+b); /*系統System的.out輸出.println列印,line列*/ for ( j = 0; j <= i

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