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 cannot execute eclipse

Build path specifies execution environment JavaSE-12. There are no JREs installed in the workspace that are strictly compatible with this environment. 
 The build path specifies the execution environment JavaSE 12. Strictly compatible with this environment is not installed in the workplace JRE.

public class  Number of daffodils  {
	public static void main(String[] ages){
		for(int a = 100 ; a<1000 ; a++){
			int b = a/100;
			int c = a/10 % 10;
			int d = a%10;
			if(Math.pow(b, 3)+Math.pow(c, 3)+Math.pow(d, 3) == a)
				System.out.println(a);
		}
	}

}




public class  Golden Section  {
    public static void main(String[] args) {
    	double h = 0.618;
    	double cha = 20;
    	int z = 0;// Molecules 
    	int m = 0;// denominator 
    			
    	for(int a = 1 ; a<20; a++){
    		for(int b = 1 ; b<20 ; b++){
    		if(0 == a%2 && 0 == b % 2)
    			continue;
    		double c =(double)a/b;
    		
    		double d =(double) Math.abs(c-h); 
    		
    		if(cha>d){
    			cha = d;
    			z = a;
    			m = b;   
    		}
    	}
    }    		
    	System.out.println(z + "/"  +  m);
    }
 }





public class  Primary school calculation  {
	public static void main(String[] agrs){
		for(int a = -100 ; a <= 99 ; a++){
			for(int b = -100 ; b <= 99 ; b++){
				for(int c = -100 ; c <= 99 ; c++){
					for(int d = -100 ; d <= 99 ; d++){
						if(a+b==8 && c-d==6 && a+c==14 && b+d==10){
							System.out.println(a);
							System.out.println(b);
							System.out.println(c);
							System.out.println(d);
						}
					}
				}
			}
			
		}
	}
}	

package String;

public class MyStringBuffer implements IStringBuffer{
	
	String s;
	
	public MyStringBuffer() {
		// TODO Auto-generated constructor stub
		this.s = new String();
	}

	public MyStringBuffer(String str) {
		// TODO Auto-generated constructor stub
		this.s = new String(str);
	}

	public String toString() {
		
		return s;
	}

	@Override
	public void append(String str) {
		// TODO Auto-generated method stub
		s = s+str;
	}

	@Override
	public void append(char c) {
		// TODO Auto-generated method stub
		s = s+String.valueOf(c);
	}

	@Override
	public void insert(int pos, char b) {
		// TODO Auto-generated method stub
		String s1 = s.substring(0,pos);
		String s2 = s.substring(pos,s.length());
		s = s1+String.valueOf(b)+s2;
	}

	@Override
	public void insert(int pos, String b) {
		// TODO Auto-generated method stub
		String s1 = s.substring(0,pos);
		String s2 = s.substring(pos);
		s = s1+b+s2;
	}

	@Override
	public void delete(int start) {
		// TODO Auto-generated method stub
		s.substring(0, start);
	}

	@Override
	public void delete(int start, int end) {
		// TODO Auto-generated method stub
		String s1 = s.substring(0,start);
		String s2 = s.substring(end);
		s = s1+s2;
	}

	@Override
	public void reverse() {
		// TODO Auto-generated method stub
		char[] cs = s.toCharArray();
		for(int i = 0;i<cs.length/2;i++) {
			char tmp = cs[i];
			cs[i] = cs[cs.length-i-1];
			cs[cs.length-i-1] = tmp;
		}
		s = String.copyValueOf(cs);
	}

	@Override
	public int length() {
		// TODO Auto-generated method stub
		return s.length();
	}
	
}

package String;

public class StringTest4 extends MyStringBuffer{

	private void time_add_string(int times) {
		
		String str = random_string(10);
		MyStringBuffer str1 = new MyStringBuffer(str);
		StringBuffer str2 = new StringBuffer(str);
		long t1 = System.currentTimeMillis();
		for(int i = 0;i<times;i++) {
	
			str1.append(random_string(10));
		}
		long t2 = System.currentTimeMillis();
		long t3 = t2-t1;
		for(int i = 0;i<times;i++) {
			
			str2.append(random_string(10));
		}
		long t4 = System.currentTimeMillis();
		long t5 = t4-t2;
		System.out.printf("MyStringBuffer The performance is %sms\n",t3);
		System.out.printf("StringBuffer The performance is %sms",t5);
	}

	private String random_string(int length) {
		// TODO Auto-generated method stub
		char[] cs = new char[length];
		short start = '0';
		short end = 'z'+1;
		for(int i = 0;i<length;i++) {
			while(true) {
				char c = (char)(Math.random()*(end-start)+start);
				if(Character.isLetter(c)||Character.isDigit(c)){
					cs[i] = c;
					break;
				}
			}
		}
		String arr = new String(cs);
		return arr;
	}
	
	public static void main(String[] args) {
		
		StringTest4 str3 = new StringTest4();
		str3.time_add_string(100000);
	}
}