String str = new String();
str = "String";
1 System.out.println(str.charAt(0)); 2 //return "S";
1 System.out.println(str.substring(1)); 2 //return "tring";
1 System.out.println(str.substring(1, 3)); 2 //return "tr";
1 System.out.println(str.indexOf("i")); 2 //return "3"; 3 4 System.out.println(str.indexOf("ing")); 5 //return "3";
int indexOf(String str, int fromIndex):返回从指定索引位置fromIndex开始的str的索引位置,如果没有返回-1
1 System.out.println(str.indexOf("ing", 2)); 2 //return "3";
1 System.out.println(str.replace("g", "gs")); 2 //return "Strings";
1 String str1 = new String(); 2 str1 = " "+"string"+" "; 3 System.out.println(str1.length()); 4 //return "8" 5 str1 = str1.trim(); 6 System.out.println(str.length()); 7 //return "6"
1 String str2 = new String(); 2 str2 = "A/B/C"; 3 String s[] = str2.split("/"); 4 System.out.println("s[0] = "+s[0]); 5 //return"A" 6 for(String ss: s) { 7 System.out.print(ss+" "); 8 } 9 //return"A B C"
String[ ] split(String regex, int limit):指定正则表达式分隔符regex和分隔份数limit,返回一个字符串数组
1 String str2 = new String(); 2 str2 = "A/B/C"; 3 String s[] = str2.split("/", 2); 4 for(String ss: s) { 5 System.out.print(ss+" "); 6 } 7 //return"A B/C"
注意: . 、 | 和 * 等转义字符,必须得加 \\
注意:多个分隔符,可以用 | 作为连字符
7、String toLowerCase():转换为小写字母
String toUpperCase():转换为大写字母
8、boolean startsWith(String prefix):如果字符串以prefix开头返回true,否则返回false
boolean endsWith(String suffix):如果字符串以suffix结尾返回true,否则返回false
9、boolean equals(Object other):如果字符串与other相等返回true,否则返回false
boolean equalsIgnoreCase(String other):如果字符串与other相等(忽略大小写)返回true,否则返回false
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