substring(beginIndex)與substring(beginIndex, endIndex)
上下界的位置。

// substring(beginIndex)String str1 = "xianyuyiling";String str2 = "仙域異靈";String getstr1 = str1.substring(0);String getstr2 = str1.substring(1);String getstr3 = str2.substring(0);String getstr4 = str2.substring(1);System.out.println(getstr1);System.out.println(getstr2);System.out.println(getstr3);System.out.println(getstr4);// substring(beginIndex, endIndex)String getstr5 = str1.substring(0, 3);String getstr6 = str1.substring(1, 3);String getstr7 = str2.substring(0, 3);String getstr8 = str2.substring(1, 3);System.out.println(getstr5);System.out.println(getstr6);System.out.println(getstr7);System.out.println(getstr8);}

結果為---------------------------------
xianyuyiling
ianyuyiling
仙域異靈
域異靈
xia
ia
仙域異
域異

2.trim():去除一個字符串兩邊的空白字符

String str1 = " xianyuyiling ";String str2 = " 仙域異靈 ";System.out.println(str1.trim());System.out.println(str2.trim());

結果為---------------------------------
xianyuyiling
仙域異靈
3.boolean startWith(String str)
boolean endWith(String str)
判斷字符串是不是以特定的字符開頭或者結束

public static void main(String[] args) {// String str1 = "xianyuyiling";String str2 = "仙域異靈";boolean startstr = str2.startsWith("域");boolean startstr2 = str2.startsWith("仙");boolean endstr = str2.endsWith("異靈");boolean endstr2 = str2.endsWith("異");System.out.println(startstr);System.out.println(startstr2);System.out.println(endstr);System.out.println(endstr2);}

結果為---------------------------------
false
true
true
false
4.將字符串轉換為大小寫

public static void main(String[] args) {String str1 = "XianYuYiLing";//String str2 = "仙域異靈";String getstr1=str1.toUpperCase();String getstr2=str1.toLowerCase();System.out.println(getstr1);System.out.println(getstr2);}

結果為---------------------------------
XIANYUYILING
xianyuyiling
5.charAt(index) ：截取一個字符

public static void main(String[] args) {String str1 = "XianYuYiLing";String str2 = "仙域異靈";System.out.println(str1.charAt(0));System.out.println(str1.charAt(2));System.out.println(str2.charAt(0));System.out.println(str2.charAt(2));}

結果為---------------------------------
X
a
仙
異
6.replace：字符串的替換

public static void main(String[] args) {String str1 = "XianYuYiLing";String str2 = "仙域異靈";System.out.println(str2.replace("域", "世"));}

結果為---------------------------------
仙世異靈
7.length()：字符串的長度。

public static void main(String[] args) {String str1 = "XianYuYiLing";String str2 = "仙域異靈";System.out.println(str1.length());System.out.println(str2.length());}

結果為---------------------------------
12
4
8.split（）：將字符串按分隔符分割成數組

public static void main(String[] args) {//String str1 = "XianYuYiLing";String str2 = "仙,域,異,靈";String [] getstr2 = str2.split(",");for(String str:getstr2) {System.out.println(str);}}

結果為---------------------------------
仙
域
異
靈
9.equals()和equalsIgnoreCase():比較字符串相等，前者區分大小寫，后者不區分

public static void main(String[] args) {String str1 = "XianYuYiLing";String str2 = "xianyuyiling";//String str2 = "仙,域,異,靈";System.out.println(str2.equals(str1));System.out.println(str2.equalsIgnoreCase(str1));}

結果為---------------------------------
false
true
10.indexof()與lastIndexof():前者是查找字符或字符串第一次出現的地方。后者是查找字符或字符串最后一次出現的地方。

public static void main(String[] args) {// String str1 = "XianYuYiLing";String str2 = "xianyuyiling";// String str3 = "仙,域,異,靈";int index1 = str2.indexOf("y");int index2 = str2.lastIndexOf("y");System.out.println(index1);System.out.println(index2);}

結果為---------------------------------
4
6
11.concat():字符串的拼接

public static void main(String[] args) {String str1 = "XianYuYiLing";String str2 = "xianyuyiling";String str3 = "仙,域,異,靈";String str4 = str2.concat(str1);String str5 = str2.concat(str1).concat(str3);System.out.println(str4);System.out.println(str5);}

結果為---------------------------------
xianyuyilingXianYuYiLing
xianyuyilingXianYuYiLing仙,域,異,靈
12.getBytes():將字符串變成一個字符數組。

public static void main(String[] args) {String str1 = "XianYuYiLing";String str2 = "xianyuyiling";String str3 = "仙,域,異,靈";byte[] getstr = str2.getBytes();for(byte str:getstr) {System.out.println(str);}}

結果為---------------------------------
120
105
97
110
121
117
121
105
108
105
110
103
13.tocharAttay()：將字符串變成一個字符數組

public static void main(String[] args) {String str1 = "XianYuYiLing";String str2 = "xianyuyiling";String str3 = "仙,域,異,靈";char[] getstr1 = str2.toCharArray();for (char str : getstr1) {System.out.println(str);}char[] getstr2 = str3.toCharArray();for (char str : getstr2) {System.out.println(str);}}

x
i
a
n
y
u
y
i
l
i
n
g
仙
,
域
,
異
,
靈
14.compareTo()和compareToIgnoreCase():按字典順序比較字符串的大小，前者比較大小寫，后者不用比較大小寫。

public static void main(String[] args) {String str2 = "xianyuyiling";String str4 = "xiaeie";String str5 = "xian";//返回ASCII碼的值，判斷不同的字符e和ySystem.out.println(str4.compareTo(str2));//返回字符的長度，前面字符串相同，返回yuyilingSystem.out.println(str5.compareTo(str2));}

結果為---------------------------------
-9
-8

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