stringtest2.java

清华大学第二版

public class StringTest2 {
	public static void main(String args[]) {
		String s1 = "This is the second string.";
		String s2 = "This is the second string.";
		String s3 = new String("This is the second string.");
		String s4 = new String(s1);
		String s5 = s1;
		
		boolean result121= s1.equals(s2);
		boolean result122= s1==s2;
		boolean result131= s1.equals(s3);
		boolean result132= s1==s3;
		boolean result141= s1.equals(s4);
		boolean result142= s1==s4;
		boolean result151= s1.equals(s5);
		boolean result152= s1==s5;	
		
		
		
		System.out.println("s1.equals(s2)  " + result121);
		System.out.println("s1==s2         " + result122);
		System.out.println("s1.equals(s3)  " + result131);
		System.out.println("s1==s3         " + result132);
		System.out.println("s1.equals(s4)  " + result141);
		System.out.println("s1==s4         " + result142);
		System.out.println("s1.equals(s5)  " + result151);
		System.out.println("s1==s5         " + result152);
	}
}