菜鸟Java大面经----------------String相关面试题

1.

package com.ahuiby.string;

public class StringInterview_1 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String s1="abc";
		String s2="abc";
		
		System.out.println(s1 == s2);
		System.out.println(s1.equals(s2));
	}

}

2.

package com.ahuiby.string;

public class StringInterview_2 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		//下面这段代码创建了几个对象
		String s1= new String("abc");
		
	}

}

3.

package com.ahuiby.string;

public class StringInterview_3 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String s1=new String("abc");
		String s2="abc";
		
		System.out.println(s1 ==s2);
		System.out.println(s1.equals(s2));
	}

}

4.

package com.ahuiby.string;

public class StringInterview_4 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String s1="a"+"b"+"c";
		String s2="abc";
		
		System.out.println(s1 == s2);
		System.out.println(s1.equals(s2));
	}

}

5.

package com.ahuiby.string;

public class StringInterview_5 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String s1="ab";
		String s2="abc";
		String s3=s1+"c";
		
		System.out.println(s2 == s3);
		System.out.println(s2.equals(s3));
	}

}