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Copy pathStringsDemo.java
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98 lines (79 loc) · 3.64 KB
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package strings;
public class StringsDemo {
public static void main(String[] args) {
// equalsAndEqualsIgnoreCase();
// String name4 = "Alan\\tWalker";
// System.out.println(name4);
// System.out.println(name4.translateEscapes());
// String str = " John\n D.\n Wayne";
// System.out.println("--");
// System.out.println(str);
// System.out.println("--");
// System.out.println(str.indent(2));
// System.out.println("--");
// System.out.println(str.indent(-2));
// System.out.println("--");
// System.out.println(str.stripIndent());
// System.out.println("--");
// String name = " Alan Walker";
// System.out.print(name.indent(0));
// System.out.print(name.indent(10));
// System.out.print(" Alan Walker".indent(-10));
//
// System.out.println();
// System.out.println("Println: ");
// System.out.println(name.indent(0));
// System.out.println(name.indent(10));
// System.out.println(" Alan Walker".indent(-10));
// System.out.println(name.contains("A"));
// System.out.println(name.contains("a"));
// System.out.println(name.contains("walker"));
// System.out.println(name.contains("Walker"));
// System.out.println(name.startsWith("Al")); //==> true
// System.out.println(name.startsWith("al")); //==> false
// System.out.println(name.endsWith("Walker")); //==> true
// System.out.println(name.endsWith("walker")); //==> false
// System.out.println(name.length());
// System.out.println(name.charAt(2));
// System.out.println(name.charAt(12));
//String poolExample
String name = "Alan"; //value store in String pool, for value create compile time
String name2 = "Alan ".trim(); //not store in String pool, for .trim() is evaluated at runtime
String name3 = new String("Alan"); // keyword new instant object
String name4 = new String("Alan").intern(); //push Alan into String pool
String name5 = new String("Alan").intern();
String name6 = "Al"+"an"; //concatenation is done in the compile-time
System.out.println(name == name2);
System.out.println(name == name3);
System.out.println(name == name4);
System.out.println(name == name5);
System.out.println(name == name6);
}
public static void concatString(){
String a = "1";
String b = "2";
String a1 = "a";
int b1 = 2;
System.out.println("Both is Number: "+a + b); //String is Number
System.out.println("String plus number: "+a1 + b1); // String plus number
System.out.println("String plus String: "+ "Alan " + "Walker"); //String plus String
//notice: need check from left to right
// if left is String all String
System.out.println("a" + 1 + 2); //==> a12
// if left is number and after that is number, can plus and then addition to String
System.out.println(1 + 2 + "a"); //==> 3a
//if you use parentheses for two number and first is String
//plus in parentheses first and then addition with String
System.out.println("a" + (1+2));
System.out.println("a"+null);
}
public static void equalsAndEqualsIgnoreCase(){
String name1 = "Alan Walker";
String name2 = "ALAN WALKER";
String name3 = "alan walker";
System.out.println(name1.equals(name2));
System.out.println(name1.equals(name3));
System.out.println(name1.equalsIgnoreCase(name2));
System.out.println(name2.equalsIgnoreCase(name3));
}
}